Word.ws English Dictionary

How to use unknown in a sentence

40 example sentences · adjective, noun

Unknown means not known; unidentified; not well known. Example: “The concept has existed since times unknown.”

Examples of unknown by meaning

adjectiveNot known; unidentified; not well known.

  • The concept has existed since times unknown.
  • I suspect that this large and complex military railway system, shrouded in official secrecy for most of its operational life, remains unknown to many people.2022 January 12, Chris Hegg, “The secret railway in the woods”, in RAIL, number 948, page 34

nounAny thing, place, or situation about which nothing is known; an unknown fact or piece of information.

  • Had God walked close beside her into the unknown?1957, Ethel Erford Hewitt, Into the Unknown: An Historical Novel, page 351
  • None of them much more than a mile from home, they carried the aura of a close-knit community as a shield against against the unknown.1980, AA Book of British Villages, Drive Publications Ltd, page 217
  • We also know There are known unknowns.2003 [2002], Donald Rumsfeld, edited by Hart Seely, Pieces of Intelligence: The Existential Poetry of Donald H. Rumsfeld

nounA person of no identity; a nonentity.

  • Khaleque, the landowner, who had contributed most of the money needed to transform the neglected burial-place of an unknown into a mazar, masked his pride and pleasure with difficulty.1967 [1949], Syed Waliullah, chapter 3, in Tree Without Roots (Fiction), London: Chatto & Windus, →OCLC, page 27

More sentences with unknown

  • At the time, Einstein's theory was unknown to most other scientists.From the entry known
  • You must shed your fear of the unknown before you can proceed.From the entry shed
  • The exploration of unknown areas was often the precursor to colonization.From the entry exploration
  • The discovery of a previously unknown species had taken place nearly two years previously.From the entry previously
  • If an equation has three unknowns, you can plug in two of them to find the third.From the entry plug in
  • The floor of the cave was covered with the exuvial remains of unknown creatures.From the entry exuvial
  • I take him for some fiend, I wiss. — Grim, the Collier of Croydon, author unknown.From the entry I wiss
  • You have to tell the knowns from the unknowns.From the entry known
  • Bravo Three, this Bravo Six. Immediate! We are coming under fire from the north from an unknown enemy, over!From the entry immediate
  • Despite thorough investigation, the perpetrator of the attacks remains unknown.From the entry investigation
  • He took a chance by supporting the unknown artist.From the entry take a chance
  • The lushly verdant jungle harbored many plants unknown to outsiders.From the entry lushly
  • Archers attempted to take down an unknown swordsman.From the entry swordsman
  • This tristate logic deals with true, false, and unknown values.From the entry tristate
  • Having spotted an unknown contact on radar, the navigation officer attempted to identify the vessel using the ship's AIS.From the entry ais
  • However, it is unknown if Shaylene or someone else was behind the wheel of the vehicle.2026 August 6, Nicholas Muhoro, “An Ohio Teen Vanished During a One-Mile Drive in 1994. Her Locked Car Was Found Hours Later”, in Skip…. From the entry behind the wheel
  • Lynchian worlds are enchanted (and haunted) worlds, permeable and multi-layered, filled with the unknown and the spiritual.2025 April 10, Chris Thiessen, “Embracing mystery with David Lynch”, in The Christian Century. From the entry Lynchian
  • The recipe for shakudo is unknown; each Japanese metalsmith had his own secret recipe.2024 May 16, Jill Newman, “When Form(s) Follows Function”, in The New York Times. From the entry metalsmith
  • “Unprovenienced” is to be differentiated from “unprovenanced,” which refers to artifacts whose ownership history is unknown.2024 April 3, Christopher J. Foster, Glenda Chao, and Mercedes Valmisa, “The Methods and Ethics of Researching Unprovenienced Artifacts…. From the entry unprovenanced
  • The remains of 62 people were dug up at the previously unknown archaeological site near Garforth.2023 March 13, Lianne Kolirin, “Skeletal remains of Roman aristocrat discovered in hidden lead coffin”, in CNN, archived from the original…. From the entry archaeological
  • However, potential changes to flash drought risk in a warming climate remain unknown.2023 May 25, Jordan I. Christian, Elinor R. Martin, Jeffrey B. Basara, Jason C. Furtado, Jason A. Otkin, “Global projections of flash…. From the entry flash drought
  • It is unknown how the mechanism of land use affects the landscape pattern at different scales.2021 February 20, Lei Wang, Lian Wu, Wei Zhang, “Impacts of land use change on landscape patterns in mountain human settlement: The case…. From the entry Hantai
  • It’s unknown at the time of publishing why the videos were unprivated.2021 March 29, Brandon Lyttle, “Haachama X Akai Haato Story Videos Return to YouTube”, in Niche Gamer, Philadelphia, Pa.: Pretentious…. From the entry unprivate
  • Yet, to the majority of my fellow millennial friends, the cheug life seems an unknown path.2021 May 10, Mary Frances Knapp, “The Three Tiers of Cheuginess, Explained”, in VICE, archived from the original on 30 Mar 2023. From the entry cheug
  • Glorious also went down toward the end of the battle, cause unknown.2018 October 17, Drachinifel, 27:01 from the start, in Last Ride of the High Seas Fleet - Battle of Texel 1918, archived from the original…. From the entry go down
  • Sighted on Habitat 7, this unknown species has proven to be extremely dangerous.2017, BioWare, Mass Effect: Andromeda (Science Fiction), Redwood City: Electronic Arts, →OCLC, PC, scene: Unknown Species Codex entry. From the entry technologically
  • Children gleefully embracing the unknown, while their adult guardians cower in fear?2017 November 16, Leah Schnelbach, “The Birth of Spielbergian: Close Encounters of the Third Kind at 40”, in Tor.com. From the entry Spielbergian
  • In these cells, much is still unknown about the cytoskeletal network, which governs the mechanoresponse.2016 January 16, “Cytoskeletal Expression and Remodeling in Pluripotent Stem Cells”, in PLOS ONE, →DOI. From the entry mechanoresponse
  • However, the contribution of plant metabolism of topramezone to this tolerance is unknown.2015 July 18, “Cytochrome P450 Inhibitors Reduce Creeping Bentgrass ( Agrostis stolonifera ) Tolerance to Topramezone”, in PLOS ONE, →DOI. From the entry topramezone
  • However, the importance of the high expression of 11β-HSD2 within the midgestational fetal brain is unknown.2015, Caitlin Wyrwoll et al., “Fetal brain 11β-hydroxysteroid dehydrogenase type 2 selectively determines programming of adult…. From the entry midgestational
  • However, some unknown factors can still be responsible for iatrogenic keratectasias.2015, H. V. Nema, Nitin Nema, Recent Advances in Ophthalmology-12 - Volume 12, →ISBN, page 88. From the entry keratectasia
  • Its exact origins are unknown, but appear to be in the Middle East.2015, Emma Borghesi, The Beans & Grains Bible, Simon and Schuster, →ISBN. From the entry Khorasan wheat
  • How do we know that the avouching unknown could not have been sold a gold brick?2015, Joseph Lewis French, The Best Psychic Stories: Famous People. From the entry gold brick
  • He was a being of unknown descent, but Rune believed he was lt least a demigod.2015, Kresley Cole, Sweet Ruin, Simon & Schuster, pages 24-25. From the entry overdeity

Meaning of unknown

  1. adjective Not known; unidentified; not well known.
  2. noun A variable (usually x, y or z) whose value is to be found.
  3. noun Any thing, place, or situation about which nothing is known; an unknown fact or piece of information.

Full definition of unknown

Questions about unknown in a sentence

How do you use unknown in a sentence?
Unknown is used as an adjective and noun. For example: “The concept has existed since times unknown.”
What is a short sentence with unknown?
“The concept has existed since times unknown.”
What does unknown mean?
Unknown means not known; unidentified; not well known.

Source and license

Adapted from Wiktionary: unknown (page history and authors) and the entries each sentence comes from. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws chose the sentences, left out offensive ones and quotations older than 1900, and marked the word in each. Wiktionary data of 2026-09-02.

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Cite this page: “How to use unknown in a sentence.” Word.ws, https://word.ws/sentences/unknown. Based on Wiktionary, CC BY-SA 4.0.