Synonyms of wacky

1 Syllable
schtick, daft, odd, mad, nuts, queer, gump, wild
2 Syllables
queerer, amok, zaniest, goofy, apest, queerest, madder, loony, batty, loopy, crackers, boffo, flakier, tomfool, birdy, crazier, screwy, schizo, witless, nutty, maddest, craziest, clocker, battiest, crazy, battier, crazed, silly, dafter, cuckoo, zanier, nuttiest, daftest, zany, aper, balmy, absurd, flaky, potty, nuttier, loonier, foolish, pottier, quirky, goofus, goofier, jokey, fooler
3 Syllables
erratic, off-the-wall, lunatic, senseless, haywire, half-cracked, foolheaded, demented, eccentric, comical, insane, softheaded, fantastic, deranged, jocular, fool-headed, hare-brained
4 Syllables
irrational, preposterous, harebrained, cockamamy, unreasoning, cockamamie, illogical, imbecilic, enthusiastic, ridiculous, bedlamite
5 Syllables
unpredictable, uncustomary