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

In the late 19th century, it was commonly believed that a criminal or lunatic could be recognized at a glance, based on certain physiognomic tells. — Adam Kirsch, The Atlantic, 15 June 2026

As a result, the party increasingly fell under the sway of the lunatic left. — Chris Roemer, Baltimore Sun, 10 June 2026

Noun

Republicans see an opportunity here, portraying progressive and socialist Democrats as lunatics and communists. — ABC News, 9 Aug. 2026

As a Spurs fan, I was particularly invested in Campbell in an England shirt and recall charging around the living room like a lunatic before the reality that it had been chalked off hit home. — The Athletic Uk Staff, New York Times, 18 June 2026