Synonyms of crackbrained

adjectiveIdiotic.

• birdbrainedSilly and frivolous; empty-headed.
• addlebrainedSynonym of addlepated.
• addlepatedAddled; confused; stupid; flustered.
• airheaded
• bee-brainedExtremely stupid.
• beef-wittedStupid; dull.
• soft informal
• beefheadedStupid; dull-witted.
• beetle-headedMentally dull; stupid.
• blockheadedResembling a blockhead; stupid.
• Boeotian
• boneheadedResembling or characteristic of a bonehead.
• boofheadedStupid; dimwitted.
• braindead
• brainlessUnintelligent, with little common sense.
• bubbleheadedStupid; vacuous.
• buffle-headedDull; stupid; blundering.
• bullet-headedStubborn and stupid.
• cerebrally challengedOf low intelligence; stupid.
• childish
• chowderheadedStupid; foolish; lacking in common sense.
• chuckleheadedStupid, idiotic.
• cretinousCharacteristic of a cretin; very stupid.
• daft
• denseSlow to comprehend; of low intelligence. (of a person).
• dentedExtremely stupid.
• dim-bulbSlow-witted, stupid.
• dim-headedSynonym of dim-witted.
• dim-wittedBeing a dimwit; stupid; foolish; simple.
• dimNot smart or intelligent.
• doltishLike a dolt; dull in intellect; stupid.
• dopeyStupid, silly.
• dozyIntellectually slow.
• drowsyDull; stupid.
• dull-headedSynonym of dull-witted.
• dull-mindedDim-witted, stupid, unintelligent.
• dull-wittedHaving a dull, blunt wit or mind; unintelligent.
• dullNot bright or intelligent; stupid; having slow understanding.
• dumber than a box of rocksVery stupid.
• dumbStupid.
• dunderheadedStupid, foolish.
• empty-headedUnintelligent.
• fatheadedCharacteristic of a fathead; stupid.
• feeble-mindedWeak in intellectual power; lacking firmness or constancy; lacking intelligence.
• flea-brainedIdiotic.
• foolish
• fuzzy-headed
• fuzzy-mindedSynonym of fuzzy-headed: characterized by vague or confused thinking, dull-witted.
• goofy
• half-brainedExhibiting low intelligence, as if having only half a brain.
• half-wittedHaving low intelligence.
• hammer-headedStupid, ignorant.
• idiotic
• ignorant
• imbecilicLike or as an imbecile; so senseless as to be laughable; absurd, foolish, stupid, idiotic.
• inane
• insipid
• intellectually challengedOf low intelligence; stupid.
• knuckleheadedStupid or inept, like a knucklehead.
• lamebrainedFoolish; stupid.
• lowbrowUnsophisticated, not intended for an audience of intelligence, education or culture.
• lumpishDull and slow in acting, thinking, etc.; without energy; cloddish, lethargic, slow-witted, sluggish.
• lunkheadedObtuse; foolish; idiotic.
• mentally challengedHaving low intelligence.
• mentally retarded offensiveIntellectually disabled, medically defined as having an IQ (intelligence quotient) below 70 in addition to deficits in...
• mindless
• monosynaptic
• moronic
• muttonheadedBeing a muttonhead; stupid or foolish.
• nitwittedBeing like a nitwit; being foolish or stupid.
• numbskulledStupid.
• oafishCharacteristic of or resembling an oaf; clumsy, stupid.
• obtuse
• peabrainedStupid; moronic.
• prattyStupid, silly.
• pudding-headedStupid.
• puerile
• purblind literaryOf a person: lacking in discernment or understanding; dim-witted, unintelligent.
• quarter-wittedHaving or displaying half the mental capacity of a half-wit.
• retarded offensive
• ridiculous
• rockheadedBoneheaded, stupid.
• sharp as a bowling ballNot at all sharp-witted; very stupid.
• sheep-headedSilly; simple-minded; stupid.
• silly
• simpleFeeble-minded; foolish.
• slow
• slow on the uptakeOf a person, slow to comprehend or process intellectually.
• slow-wittedLacking a keen or swift intellect, not too bright or not too swift.
• smooth-brainedStupid, foolish; ignorant.
• stolidDully or heavily stupid.
• stupid
• thick-skulledSynonym of thickheaded.
• thickheadedStupid, obtuse or dumb.
• thickwittedStupid, dim-witted.
• thickStupid.
• unapprehensive
• uncleverNot clever.
• uninformed
• unintelligentNot intelligent.
• unsmartNot smart (in various senses).
• vacant
• vacuousShowing a lack of thought or intelligence; vacant.
• witless
• wooden-headedStupid; mentally dull.
• wool-headed
• woolly-headed
• woolly-minded
• dumb as a bag of hammersRemarkably stupid.
• dumb as a box of rocksVery stupid.
• dumb as a doorknobVery stupid.
• dumb as an oxStupid.
• dumb as a postExtremely stupid.
• dumb as a sack of hammersSynonym of dumb as a bag of hammers.
• dumb as dirtExtremely stupid.
• dumber than a rockExtremely stupid.
• not the sharpest crayon in the boxSynonym of not the sharpest knife in the drawer.
• not the sharpest knife in the drawerLacking in intelligence; dimwitted.
• not the sharpest tool in the shedLacking in intelligence; dimwitted.
• thick as a brickVery stupid; slow to learn or understand.