Synonyms of brainless

brainless

adjective

ˈbrān-ləs 

1

as in dumb

not having or showing an ability to absorb ideas readily

a teacher who affirms that there are no brainless students, only lazy ones

Synonyms & Similar Words

• dumb
• stupid
• slow
• simple
• thick
• mindless
• dense
• ignorant
• dull
• foolish
• idiotic
• unintelligent
• brain-dead
• vacuous
• doltish
• witless
• dopey
• fatuous
• oafish
• silly
• obtuse
• boneheaded
• bonehead
• thickheaded
• soft
• weak-minded
• empty-headed
• senseless
• irrational
• gormless
• opaque
• dim-witted
• dim
• dorky
• insane
• airheaded
• unreasonable
• mad
• pinheaded
• slow-witted
• half-witted
• dunderheaded
• lamebrain
• knuckleheaded
• unsmart
• moronic
• lunkheaded
• crazy
• bubbleheaded
• birdbrained
• thick-witted
• cretinous
• softheaded
• chuckleheaded
• imbecile
• unthinking
• feebleminded
• simpleminded
• absurd
• uneducated
• uninformed
• unintellectual
• fool
• illiterate
• asinine
• lowbrow
• cuckoo
• dippy
• illogical
• nonsensical
• untaught
• loony
• zany
• daffy
• daft
• harebrained
• preposterous
• nutty
• sappy
• unwise
• kooky
• wacky
• screwball
• dotty
• crackpot
• invalid
• fallacious
• cockeyed
• half-baked
• balmy
• boobish
• tomfool
• featherheaded

Antonyms & Near Antonyms

• intelligent
• brilliant
• smart
• quick
• clever
• apt
• bright
• fast
• sharp
• keen
• ingenious
• nimble
• resourceful
• acute
• brainy
• wise
• thinking
• cerebral
• intellectual
• astute
• knowing
• savvy
• perceptive
• sagacious
• keen
• insightful
• skilled
• scholarly
• literate
• discerning
• erudite
• supersmart
• knowledgeable
• quick-witted
• hyperintelligent
• sage
• learned
• sharp-witted
• trained
• educated
• informed
• cunning
• ultrasmart
• shrewd
• sound
• perspicacious
• sapient
• sensible
• crafty
• wily
• logical
• rational
• reasonable
• highbrow
• sane
• percipient
• prudent
• well-read
• judicious
• valid
• schooled
• foxy

2

as in stupid

showing or marked by a lack of good sense or judgment

a brainless decision to talk on her cell phone while weaving in and out of traffic

Synonyms & Similar Words

• stupid
• foolish
• silly
• insane
• absurd
• mad
• crazy
• idiotic
• irrational
• dumb
• fool
• lunatic
• simple
• witless
• asinine
• fatuous
• nonsensical
• ridiculous
• unreasoning
• dippy
• loony
• zany
• daffy
• inept
• simpleminded
• unreasonable
• daft
• weak-minded
• weak
• harebrained
• preposterous
• senseless
• nutty
• cuckoo
• sappy
• unwise
• kooky
• wacko
• gaga
• wacky
• screwball
• mindless
• dotty
• crackpot
• slow
• jerky
• batty
• barmy
• half-witted
• out to lunch
• moronic
• crackbrained
• cockeyed
• lunkheaded
• bubbleheaded
• unintelligent
• thoughtless
• half-baked
• brain-dead
• balmy
• loony tunes
• vacuous
• clueless
• unreasoned
• imbecile
• empty-headed
• doltish
• meshuga
• fruity
• dull
• dopey
• dense
• oafish
• illogical
• obtuse
• tomfool
• pinheaded
• gormless
• feebleminded
• thickheaded
• featherheaded
• dunderheaded
• lamebrain
• opaque
• dim-witted
• dim
• airheaded
• dorky
• softheaded
• slow-witted
• ludicrous
• thick
• fallacious
• soft
• laughable
• knuckleheaded
• invalid
• nonrational
• farcical
• surd
• unsound
• birdbrained
• clownish
• chuckleheaded
• buffoonish
• notional
• boobish
• ill-advised
• unconsidered
• chowderheaded

Antonyms & Near Antonyms

• sound
• wise
• sensible
• intelligent
• sane
• prudent
• judicious
• smart
• clever
• bright
• reasonable
• logical
• rational
• sagacious
• valid
• brainy
• sapient
• sage
• well-advised

Example Sentences

Recent Examples of brainless

This extends well beyond the 2025 Bombers, their signature head-scratching and somewhat brainless play on the field has plagued them dating back to 2021. — James O'Connell, New York Daily News, 7 Aug. 2025

There's really no way to prep for the show — basically, just don't be brainless. — Lindsay Soll, EW.com, 25 July 2025

So, what can the neuronal activity of a tiny, brainless creature possibly tell us about the evolution of our own complex brains? — Elizabeth Rayne, Ars Technica, 15 June 2024

An oyster, immobile and nearly brainless, is hardly even an animal, despite what the taxonomists tell us. — Peter Rubin, Longreads, 9 Jan. 2024