Synonyms of ludicrous

1 Syllable
schtick, odd, mad, droll, gump
2 Syllables
off-base, unapt, madder, stupid, cockeyed, loopy, funnier, boffo, funny, tomfool, campy, sillier, witless, maddest, comic, droller, punning, laughing, crazy, screamer, silly, antic, rioter, zany, absurd, dippy, funniest, silliest, laffer, foolish, camer, fatuous, goofus, har-har, jokey, campiest
3 Syllables
stupidest, incongruous, farcical, risible, unfitting, senseless, humorous, bizarre, improper, grotesque, gelastic, foolheaded, outlandish, thick-headed, comical, burlesque, parodic, softheaded, fantastic, jocular, fool-headed, facetious, side-splitting, moronic, laughable
4 Syllables
out-of-place, out-of-season, preposterous, unbefitting, extravagant, cockamamy, muddleheaded, derisory, nonsensical, imbecilic, imbecile, ridiculous
5 Syllables
inapposite, caricatural