Synonyms of lunatic

lunatic 1 of 2

adjective

informal

as in foolish

showing or marked by a lack of good sense or judgment

such lunatic clowning during a solemn ceremony is completely inappropriate

Synonyms & Similar Words

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

Antonyms & Near Antonyms

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

lunatic

2 of 2

noun

informal

as in fool

a person who lacks good sense or judgment

No, you can't ski off the roof, you lunatic!

Synonyms & Similar Words

• fool
• maniac
• idiot
• goose
• moron
• nut
• nutcase
• cuckoo
• simpleton
• ninny
• jackass
• loser
• dingbat
• monkey
• booby
• nitwit
• doofus
• turkey
• simp
• nincompoop
• half-wit
• madman
• charlie
• dipstick
• ding-dong
• berk
• mooncalf
• daredevil
• ninnyhammer
• git
• featherhead
• nit
• imbecile
• dummy
• donkey
• know-nothing
• ding-a-ling
• ignoramus
• dolt
• yo-yo
• knucklehead
• goon
• dunce
• blockhead
• pinhead
• weirdo
• airhead
• numskull
• kook
• character
• crackpot
• scatterbrain
• dope
• dork
• schnook
• gander
• schlub
• oddball
• laughingstock
• fathead
• screwball
• chump
• dodo
• dupe
• crank
• schlemiel
• birdbrain
• dumbbell
• mockery
• stock
• butt
• codger
• schlump
• featherbrain
• crackbrain

Antonyms & Near Antonyms

• brain
• genius
• sage
• thinker

Example Sentences

Recent Examples of lunatic

Adjective

Police found Mazariegos, who fit the description of the lunatic hiding in the bushes, nearby, according to the probable cause affidavit. — Sean Joseph Outkick, FOXNews.com, 13 May 2026

Richard Attenborough once mischievously locked his brother inside a padded cell in a building on campus that was once a Victorian lunatic asylum, according to the university. — Amarachi Orie, CNN Money, 8 May 2026

Noun

Mark Hamill has been a lunatic for years now. — Zach Dean Outkick, FOXNews.com, 8 May 2026

To get a sentence like that in a communist, radically left-wing city of liberal lunatics is truly amazing. — Voice Of The People, New York Daily News, 29 Apr. 2026