12-Letter Words Starting with U

All 274 twelve-letter words that start with U

UB

• ubiquitously26adv. In a ubiquitous manner.

UL

• ultracompact20adj. Extremely compact; of utmost compactness.
• ultramontane14adj. Promoting the supremacy of the Pope.
• ultrarunning13n. The running of ultramarathons.
• ultraviolent15adj. Extremely violent; of utmost violence.

UN

• unacceptable20adj. Unsatisfactory; not acceptable.
• unacceptably23adv. Not within the limits of what is generally considered to be acceptable.
• unaccessible18adj. Not accessible.
• unaccredited18adj. Not accredited; lacking accreditation.
• unaccusative19adj. Intransitive and having an experiencer as its subject, that is, the...
• unaccustomed19adj. Not used to an event or thing, not accustomed.
• unachievable22adj. That cannot be achieved (or only with great difficulty).
• unacquainted24adj. Not acquainted, unfamiliar (with someone or something).
• unadvertised17adj. Not advertised.
• unaffectedly24adv. In an unaffected manner; sincerely and genuinely.
• unaffiliated19adj. Not affiliated, not associated.
• unaffordable21adj. Too expensive to be afforded.
• unaggressive17adj. Not aggressive; peaceable; not violent.
• unanswerable17adj. Not answerable; impossible to answer.
• unapologetic17adj. Not apologetic for having said or done something that causes actual or...
• unappealable18adj. Not appealable; that may not be appealed, or sent to a higher court for...
• unappeasable18adj. Not able to be appeased or satisfied.
• unappetizing26adj. Not appetizing.
• unassailable14adj. Secure against attack; impregnable.
• unassociated15adj. Having no statistical association.
• unassumingly18adv. In an unassuming manner.
• unattainable14adj. Impossible to attain or reach; unable to accomplish.
• unattractive17adj. Not handsome or beautiful or appealing.
• unattributed15adj. Lacking attribution; of unknown authorship.
• unauthorized25adj. Not having any authority.
• unbelievable19adj. Not to be believed.
• unbelievably22adv. In a manner that one does not or cannot believe.
• unblinkingly22adv. Without blinking; firmly.
• unbreachable21adj. Impossible to breach.
• unbreathable19adj. Not suitable for breathing.
• unbridgeable18adj. Unable to be bridged or crossed; impossible to span.
• uncalculated17adj. Not calculated; lacking forethought.
• uncalibrated17adj. Not calibrated.
• uncatalogued16adj. Not catalogued.
• uncelebrated17adj. Not celebrated; ignored.
• uncertainity17n. Synonym of uncertainty.
• unchallenged19adj. Not having any challengers.
• unchangeable20adj. Not changeable; incapable of being changed or of changing; immutable.
• unchangeably23adv. In a way that cannot be varied, or changed.
• unchaperoned20adj. Not chaperoned; not having a chaperone.
• uncharitable19adj. Not charitable.
• uncharitably22adv. In an uncharitable manner.
• unchivalrous20adj. Not chivalrous.
• uncirculated17adj. Not circulated.
• unclassified18adj. Not classified.
• uncommercial20adj. Not commercial; often specifically not commercially viable.
• uncomparable20adj. Not able to be compared; not comparable.
• uncompressed19adj. Not having been compressed.
• unconference19n. A conference that attempts to avoid the traditional drawbacks of...
• unconformity22n. A gap in the stratigraphic record at a site, resulting from erosion...
• unconjugated23adj. Not conjugated.
• unconsidered16adj. Not carefully planned or thought through beforehand. (of an action or...
• uncontracted17adj. Not contracted.
• uncontrolled15adj. Not controlled; not under control.
• unconvincing20adj. Not convincing, plausible or believable.
• uncorrelated15adj. Not correlated.
• uncritically19adv. In an uncritical manner.
• uncultivated18adj. Not cultivated by agricultural methods; not prepared for cultivation.
• undeciphered21adj. Not deciphered.
• undefeatable18adj. Not defeatable; impossible to defeat.
• undefendable19adj. Not capable of being defended.
• undemocratic19adj. Not democratic.
• undependable18adj. Not dependable.
• underachieve21v. To achieve less than expected; to fail to fulfil one's potential.
• underclothes18n. Clothes worn next to the skin and underneath outer clothing.
• undercoating16n. A coat of paint or other material applied onto a surface before that of...
• undercurrent15n. A current of water which flows under the surface, and often in a...
• undercutting16n. An undercut; a cut in the lower part.
• underdrawing18n. A sketch done on the ground of a work of art before paint, pastel, ink...
• underdressed15adj. Insufficiently dressed, as for cold weather.
• underfeeding18n. Inadequate feeding.
• underfunding18n. The condition of being underfunded.
• undergarment16n. Any garment worn underneath others, especially one worn next to the...
• underinsured14adj. Not having sufficient insurance to cover loss or damage.
• underlayment18n. Something that is underlaid, such as planking in a room of a house...
• underpayment20n. An insufficient payment.
• underperform20v. To underachieve; to fail to reach standards or expectations, especially...
• underpinning16n. A support or foundation, especially as a structure of masonry that...
• underpowered19adj. Having insufficient power for its operation.
• underpricing18n. The setting of a price too low.
• underscoring16n. An underline.
• underselling14n. The act or practice of underselling.
• undersheriff22n. In certain jurisdictions, a deputy sheriff; second in command to a...
• understaffed20adj. Having an inadequate number of workers or assistants.
• understudied15adj. Insufficiently studied.
• undersurface18n. The underneath surface; the bottom, or underside.
• undertrained14adj. Not having adequate training.
• undervaluing17n. An undervaluation.
• undervoltage17n. A voltage that is too low.
• underwriting17n. The act of something being underwritten financially.
• undeservedly20adv. In an undeserved manner.
• undesignated15adj. Not designated.
• undetectable17adj. Unable to be detected; not detectable.
• undetermined16adj. Not determined; not settled; not decided.
• undiminished19adj. Not diminished.
• undiplomatic19adj. Not diplomatic or tactful.
• undiscerning16adj. Not discerning.
• undischarged20adj. Not discharged.
• undiscounted16adj. Not discounted.
• undiscovered19adj. That has not been discovered; unknown, unexplored.
• undisputedly19adv. In a way, or to an extent, that is not disputed.
• undistracted16adj. Not distracted.
• undocumented18adj. Lacking instructions or reference material.
• unduplicated18adj. Not duplicated.
• uneconomical18adj. Not economical.
• unemployable21adj. Not employable.
• unemployment21n. The state of having no job; joblessness.
• unencumbered19adj. Not burdened with worries, cares or responsibilities.
• unenumerated15adj. Not enumerated; not individually listed.
• uneventfully21adv. In an uneventful manner.
• unexpectedly27adv. In an unexpected manner.
• unexpurgated23adj. Not expurgated, not having had anything objectionable removed.
• unfaithfully24adv. In an unfaithful manner.
• unfathomable22adj. Especially of depth: physically incapable of being measured...
• unfathomably25adv. In an unfathomable manner; beyond understanding.
• unfavourable20adj. Serving to hinder or oppose; adverse, disadvantageous, inconducive...
• unfavourably23adv. UK standard spelling of unfavorably.
• unfertilized25adj. Not fertilized; uninseminated.
• unflattering16adj. Not flattering.
• unforgivable21adj. Not forgivable; inexcusable.
• unforgivably24adv. In an unforgivable manner.
• unformulated18adj. Not formulated.
• unfrequented25adj. Not frequented.
• unfulfilling19adj. Not producing fulfillment or a sense of accomplishment; unsatisfying.
• ungovernable18adj. Not governable; unable to be governed.
• ungracefully21adv. In an ungraceful manner.
• ungraciously18adv. In an ungracious manner.
• ungratefully19adv. In an ungrateful manner, done in a way lacking gratitude.
• unguaranteed14adj. Not guaranteed; nonguaranteed.
• unhesitating16adj. Not hesitating; with no hesitation.
• unhistorical17adj. Not historical; not based on history.
• unidentified17adj. Not identified; having an unknown or unnamed identity.
• unilaterally15adv. In a unilateral or one-sided way.
• unimaginable17adj. Unable to be imagined; inconceivable or mind-boggling; beyond belief.
• unimaginably20adv. To an extent or in a way that cannot be, or could not have been...
• unimolecular16adj. Involving a single molecule.
• unimportance18n. Lack of importance.
• unimpressive19adj. Lacking the ability to impress, inability to produce an impression.
• unimprovable21adj. Not capable of being improved.
• uninfluenced18adj. Not influenced.
• uninstructed15adj. Not instructed.
• uninterested13adj. Not interested; indifferent, not concerned.
• unionization21n. The act of forming a trade union.
• uniprocessor16n. A single processor (CPU) that can work sequentially on a single task at...
• unironically17adv. In an unironic manner; without irony; sincerely; genuinely.
• unirradiated14adj. Not irradiated.
• unitarianism14n. The belief in a single God, not divided into any aspects, particularly...
• universalism17n. The state of being universal; universality.
• universalist15adj. Universal in scope.
• universality18n. The property of being universal, common to all members of a class.
• universalize24v. To make universal, to make consistent or common across all cases.
• unlawfulness18n. The state of being unlawful.
• unlikelihood20n. Absence of likelihood; the state of being unlikely or improbable...
• unlikeliness16n. The property of being unlikely, improbability.
• unlistenable14adj. Of a sound, quality, or characteristic, that a person cannot listen to...
• unlubricated17adj. Not lubricated.
• unmaintained15adj. Not maintained.
• unmanageable17adj. Not manageable; not readily submitting to handling or management; not...
• unmanageably20adv. In an unmanageable manner; uncontrollably.
• unmanifested18adj. Not manifested.
• unmarketable20adj. Not marketable.
• unmeasurable16adj. Not able to be measured; immeasurable.
• unmercifully22adv. In an unmerciful manner.
• unmethylated21adj. Not methylated.
• unmistakable20adj. Unique, such that it cannot be mistaken for something else.
• unmistakably23adv. In an unmistakable manner; unquestionably.
• unmyelinated18adj. Not myelinated.
• unnoticeable16adj. Not noticeable.
• unnoticeably19adv. In an unnoticeable manner.
• unobservable19adj. That cannot be observed.
• unobstructed17adj. Not obstructed.
• unobtainable16adj. Unable to be obtained: not able to be acquired or reached.
• unofficially23adv. In a way that is not official; in an unofficial manner.
• unornamented15adj. Not ornamented; without ornament.
• unparalleled15adj. Having no parallel; without equal; lacking anything similar or worthy...
• unpardonable17adj. Impossible to pardon; impossible to excuse or justify.
• unpatentable16adj. Not patentable; that cannot be patented.
• unpersuasive17adj. Not persuasive.
• unphotogenic20adj. Not photogenic.
• unpleasantly17adv. In an unpleasant manner.
• unpopularity19n. The property or degree of being unpopular, or the absence or lack of...
• unprejudiced25adj. Not prejudiced.
• unprescribed19adj. Not prescribed.
• unprincipled19adj. Lacking moral values.
• unprivileged19adj. Not having special privileges, opposite of privileged.
• unproductive20adj. Not productive; useless; fruitless.
• unprofitable19adj. Not making a profit.
• unprofitably22adv. In an unprofitable manner.
• unprogrammed20adj. Not programmed.
• unpropitious16adj. Not propitious; unfavourable, untimely.
• unprosecuted17adj. Not prosecuted.
• unpublicized28adj. Not publicized.
• unquantified25adj. Not quantified (in any sense).
• unquenchable28adj. That cannot be quenched.
• unquestioned22adj. Not subjected to an interrogation.
• unrealizable23adj. Not realizable; unable to be achieved or realized.
• unreasonable14adj. Without the ability to reason; unreasoning.
• unreasonably17adv. In an unreasonable manner.
• unrecognized25adj. Not matched in memory.
• unreconciled17adj. Not reconciled.
• unredeemable17adj. Not redeemable; irredeemable.
• unreferenced18adj. Not referenced.
• unreflective20adj. Not reflective; thoughtless.
• unregenerate13adj. Which cannot be transformed in mind and spirit.
• unregistered14adj. Not registered.
• unreimbursed17adj. Not reimbursed.
• unreinforced18adj. Not reinforced.
• unremarkable20adj. Not remarkable.
• unremarkably23adv. In a way or to an extent that is unremarkable.
• unremembered19adj. Not remembered.
• unrepairable16adj. Impossible to repair.
• unrepeatable16adj. Unable to be repeated.
• unresearched18adj. Not researched.
• unresectable16adj. Of a tumor: unable to be removed through surgery because of the size...
• unreservedly19adv. In an unreserved manner; showing emotion or lack of restraint.
• unresolvable17adj. Not able to be resolved.
• unresponsive17adj. Not responsive; unreactive.
• unrestrained13adj. Immoderate; not restrained or held in check; inordinate (literary).
• unrestricted15adj. Not restricted or confined.
• unreviewable20adj. Not able to be reviewed, or not subject to review.
• unroadworthy22adj. Describing a vehicle which is not safe for use on the road.
• unsanctified18adj. Not having been sanctified; not made sacred; remaining mundane or...
• unsanctioned15adj. Not sanctioned; not approved by a sanctioning body.
• unsatisfying19adj. Not providing satisfaction.
• unsaturation12n. The degree or condition of being unsaturated.
• unscientific19adj. Not scientific.
• unscriptural16adj. Not scriptural.
• unscrupulous16adj. Without scruples; immoral.
• unsearchable19adj. That cannot be sought out or looked for.
• unseasonable14adj. Not in accordance with the season.
• unseasonably17adv. Not in accordance with the season.
• unsettlingly16adv. In an unsettling manner.
• unsocialized24adj. Not having been socialized.
• unstabilized24adj. Not stabilized; potentially unstable.
• unsteadiness13n. The quality of being unsteady.
• unsterilized22adj. Not sterilized.
• unstimulated15adj. Not stimulated.
• unstintingly16adv. In an unstinting manner.
• unstructured15adj. Lacking structure.
• unsubsidized25adj. Not subsidized.
• unsuccessful19adj. Failed, not successful.
• unsupervised18adj. Not supervised; not being constantly observed.
• unsupportive19adj. Not supportive.
• unsuppressed17adj. Not suppressed.
• unsurprising15adj. Not surprising; expected.
• unsurvivable20adj. From which survival is difficult or impossible.
• unsuspecting17adj. Not suspecting; without any suspicion.
• unsuspicious16adj. Not suspicious; not suspecting, unaware (of something).
• unswervingly22adv. Without deviation; not swerving.
• unsystematic19adj. Not systematic; random, disorganised, or unthorough.
• unthinkingly23adv. In an unthinking manner.
• unthoughtful22adj. Inconsiderate of the feelings of others.
• unthreatened16adj. Not threatened; safe.
• untranslated13adj. Not translated; still in the original language.
• untruthfully21adv. In an untruthful manner; falsely.
• unvaccinated20adj. Not vaccinated.
• unvanquished28adj. Not vanquished; unbeaten or unconquered.
• unventilated16adj. Not ventilated, lacking ventilation.
• unverifiable20adj. Not capable of being verified, confirmed, checked or proven.
• unwaveringly22adv. In an unwavering manner.
• unworthiness18n. The characteristic or condition of being unworthy.

UP

• upconversion19n. The process by which two photons combine in a nonlinear medium to...
• upholstering18n. The padding, springs, webbing, and covers found on furniture.
• upregulation15n. The process, in the regulation of gene expression, in which the number...
• uproariously17adv. In an uproarious manner.

UR

• urbanization23n. The process of the formation and growth of cities.
• ureteroscopy19n. Visual inspection of the ureter by means of a ureteroscope.
• urolithiasis15n. Formation of, and thus also presence of, calculi in the urinary tract.

US

• usufructuary20adj. Of or pertaining to a usufruct.

Questions about these words

How many twelve-letter words that start with U are there?

Word.ws lists 274 twelve-letter words that start with U, plus 2,507 rare ones.

What are common twelve-letter words that start with U?

unemployment, unbelievable, unacceptable, unreasonable, unsuccessful, unexpectedly, unidentified and unauthorized.

Which of the twelve-letter words that start with U has the highest letter score?

unvanquished scores 28 points with the standard letter tile values.

Related word lists

• 12-Letter Words
• Words That Start with U
• 11-Letter Words Starting with U
• 13-Letter Words Starting with U
• Q Words Without U