Phrase guide

smooth brain

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

No pronunciation record was provided for this word.

1

noun

Meaning 1

A stupid person.

Definition source: English Wiktionary via Wiktextract

Usage: derogatory, offensive

Examples

  • I could not have made it easier for you smooth brains, yet you still messed up!

Meaning relationships

Synonyms: alcatote, asshat, arsehole, asshole, bayard, berk, birdbrain, blither, bobchin, bonehead, bozo, buffoon, brickhead, Charlie, chucklehead, chowderhead, chump, clart, clown, der-brain, dill pickle, dim bulb, dimwit, dingleberry, dipshit, dipstick, dirtbrain, div, divvo, divvy, dolt, donk, doodle, doofus, dope, dork, dote, dotterel, dullard, dumbass, dumbbell, dumbo, dumb fuck, dummy, dunce, dunderhead, dupe, fathead, fenderhead, fiddle, fuckwit, fuzznut, geck, gig, gink, goober, gooseberry, gowk, gubbins, gump, half-baked, ha'p'orth, Homer Simpson, ignoramus, imbecile, jamoke, jerk, jerkoff, jolterhead, jolthead, juggins, jughead, knucklehead, lamebrain, mameluke (US (Italian-American), slang), maroon, meathead, mong, moron, mug, muggins, mushhead, nimrod, nincompoop, nit, nitwit, not the sharpest knife in the drawer, numskull, numps, numpty, nupson, oaf, pillock, pinhead, plonker, prat, retard, shit for brains, shithead, shitwit, schmo, schmuck, smooth brain, snapperhead, softhead, sohai, sot, stupid, sucker, thickhead, tonto, tool, tosser, tosspot, tubelight, twat, twerp, twit, wally, wantwit, wazzock, yampy, addle-brain, addlehead, addle pate, airhead, baboon, beanbrain, beetlebrain, beetlehead, bimbo, blockhead, blubberbrain, Boeotian, boob, brainlet, bubblehead, bubble brain, bufflehead, cittern-head, clod, clodpate, clot, crackhead, cretin, cuckoo, deadhead, dimbo, dimbus, dingbat, ding dong, dingwad, dip, doldrum, donut, doof, doofoid, drivel, drongo, drool bucket, dumb bunny, dumb cluck, dumbhead, dumble, dumbling, dumbnut, dummkopf, dunderpate, eejit, featherbrain, fleabrain, fool, fopdoodle, galoot, gimboid, gomer, gonk, goof, goofball, goofy, goon, goose, goosecap, gorbuson, gudgeon, halfwit, ha'porth, hammerhead, idiot, inbred, jackaninny, jellybrain, knothead, lackwit, log, loggerhead, lummox, lunk, lunkhead, meatball, mental midget, mome, momo, mongoloid, mongtard, monkey, mouth breather, muttonhead, mutt, ninny, ninnyhammer, noddy, noodlehead, numbskull, peabrain, peagoose, pigwidgeon, plank, put, putz, sap, saphead, silly, simp, simpleton, space cadet, spanner, stupe, stupid-head, tard, thickskull, thicko, tomfool, toolbox, turkey, wazzer, witless wonder, yo-yo, zany, Vulgar:, ass, assclown, asshead, asstard, asswipe, buttbreath, dildo, donkey dick, Alternative spelling of dumbass., dumbfuck, dumbfucker, dumbshit, farthead, fuck-knuckle, fucktard, jackass, peckerhead, shitbrain, shitneck

Antonyms: none provided

2

noun

Meaning 2

Used other than figuratively or idiomatically: see smooth, brain.

Definition source: English Wiktionary via Wiktextract

Usage: derogatory, offensive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Nominalization of smooth-brained, possibly by reference to lissencephaly (a brain abnormality, usually resulting in severe developmental delay, characterized by the surface of the brain being smooth), or simply by reference to the human brain typically being wrinkly.