Synonyms of fatuous

adjectiveObnoxiously stupid; vacantly silly; content in one's foolishness.

• vacuousShowing a lack of thought or intelligence; vacant.
• addlebrainedSynonym of addlepated.
• addlepatedAddled; confused; stupid; flustered.
• airheaded
• bee-brainedExtremely stupid.
• beef-wittedStupid; dull.
• soft informalFoolish.
• beefheadedStupid; dull-witted.
• beetle-headedMentally dull; stupid.
• birdbrainedSilly and frivolous; empty-headed.
• blockheadedResembling a blockhead; stupid.
• Boeotian
• boneheadedResembling or characteristic of a bonehead.
• boofheaded
• braindead
• brainless
• bubbleheadedStupid; vacuous.
• buffle-headed
• bullet-headed
• cerebrally challengedOf low intelligence; stupid.
• childish
• chowderheadedStupid; foolish; lacking in common sense.
• chuckleheadedStupid, idiotic.
• crackbrainedIdiotic.
• cretinousCharacteristic of a cretin; very stupid.
• daftFoolish, silly, stupid.
• dense
• dented
• dim-bulbSlow-witted, stupid.
• dim-headedSynonym of dim-witted.
• dim-wittedBeing a dimwit; stupid; foolish; simple.
• dim
• doltishLike a dolt; dull in intellect; stupid.
• dopeyStupid, silly.
• dozy
• drowsy
• dull-headedSynonym of dull-witted.
• dull-mindedDim-witted, stupid, unintelligent.
• dull-wittedHaving a dull, blunt wit or mind; unintelligent.
• dull
• dumber than a box of rocksVery stupid.
• dumb
• dunderheadedStupid, foolish.
• empty-headed
• 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.
• goofyQuirky or silly, often in a humorous manner; daft.
• half-brainedExhibiting low intelligence, as if having only half a brain.
• half-wittedHaving low intelligence.
• hammer-headed
• idiotic
• ignorant
• imbecilicLike or as an imbecile; so senseless as to be laughable; absurd, foolish, stupid, idiotic.
• inaneLacking sense or meaning, often to the point of boredom or annoyance.
• 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.
• lumpish
• lunkheadedObtuse; foolish; idiotic.
• mentally challenged
• 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 literary
• quarter-wittedHaving or displaying half the mental capacity of a half-wit.
• retarded offensive
• ridiculous
• rockheaded
• sharp as a bowling ballNot at all sharp-witted; very stupid.
• sheep-headed
• 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-brained
• stolid
• stupid
• thick-skulledSynonym of thickheaded.
• thickheadedStupid, obtuse or dumb.
• thickwittedStupid, dim-witted.
• thick
• unapprehensive
• uncleverNot clever.
• uninformed
• unintelligentNot intelligent.
• unsmartNot smart (in various senses).
• 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 post
• 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.