Silly silly mad foolish absurd crazy lunatic idiotic irrational ridiculous looney whacky dumb zany wacky nutty idiot uncomplicated loony nonsensical idiotical unreasonable kooky asinine weak daft unwise preposterous sluggish cuckoo fatuous dippy jerky senseless daffy sappy out to lunch screwball harebrained dotty witless inept simpleminded brainless weak-minded crackpot unreasoning kookie moronic balmy cockeyed half-baked tomfool bubbleheaded illogical lunkheaded featherheaded clueless thoughtless 50 percent-witted dense imbecile imbecilic dopey ludicrous dull unreasoned unintelligent dorky senseless dim obtuse feebleminded brain-useless vacuous lamebrain doltish opaque thickheaded thick invalid laughable pinheaded comfortable fallacious dunderheaded farcical oafish nonrational dopy softheaded lamebrained unsound surd 헬스케어 knuckleheaded clownish empty-headed dim-witted gormless chuckleheaded airheaded notional sluggish-witted ill-recommended boobish buffoonish chowderheaded birdbrained unconsidered
indifferent apathetic informal unenthusiastic unconcerned uninterested nonchalant disinterested aloof detached incurious insouciant hesitant impassive stolid hesitant lackadaisical unwilling lukewarm uneager languid averse halfhearted languorous spiritless loath disinclined loth loathe See Far more
You need to use it to mean not practical a crazy idea . It's also possible to use it to suggest pretty indignant, incredibly enthusiastic or extremely energized: She'll go crazy if she finds out. The crowd went crazy.