ludicrous

Synonyms antic, chucklesome, comedic, comic, comical, droll, farcical, hilarious, humoristic, humorous, hysterical (also hysteric), killing, laughable, ludicrous, ridiculous, riotous, risible, screaming, sidesplitting, uproarious

Related Words amusing, diverting, entertaining; clownish, knockabout, slapstick, slapsticky, zany; facetious, flip, flippant, pert, smart, smart-aleck, smart-alecky, snickery; jocular, playful, waggish; campy, jokey (also joky); priceless, rich, whimsical, witty, wry; blithesome, gleeful, jocose, jocund, jolly, jovial, laughing, mad, merry, mirthful

Near Antonyms earnest, grave, no-nonsense, sedate, serious, severe, sober, sobersided, solemn, somber (or sombre), staid, unsmiling, weighty; affecting, moving, poignant, touching, tragic (also tragical); lachrymose, mournful, sad, sorrowful, tearful, woeful

Antonyms humorless, lame, unamusing, uncomic, unfunny, unhumorous, unhysterical

Synonyms absurd, cockamamy (or cockamamie), comical, derisive, derisory, farcical, laughable, ludicrous, pathetic, preposterous, risible, silly

Related Words asinine, brainless, dumb, fatuous, foolish, half-baked, half-witted, harebrained, idiotic (also idiotical), imbecile (or imbecilic), inane, jerky, moronic, nonsensical, simpleminded, stupid, unwise, weak-minded, witless; balmy, cockeyed, crazy, cuckoo, daffy, daft, dotty, insane, kooky (also kookie), loony (also looney), lunatic, mad, nutty, screwball, senseless, wacky (also whacky); fantastic (also fantastical), far-fetched, inconceivable, incredible, unbelievable, unreal, unrealistic, unreasonable; illogical, irrational

Near Antonyms earnest, serious, solemn; believable, conceivable, credible, logical, rational, realistic, reasonable, sensible