Synonyms of crazy

1 Syllable

schtick, daft, mad, nuts, loon, queer, maer, rum, kook

2 Syllables

flipped, wacky, spacey, kooky, witty, queerer, goofy, queerest, mental, batty, cracked, moonstruck, freaky, cockeyed, loopy, wittier, unglued, dingy, mad-dog, crackers, psycho, spacy, ultraist, gonzo, flakier, blissful, madding, rummy, tomfool, sillier, birdy, screwy, screwball, schizo, witless, distraught, nutty, rumer, fruity, sappy, frantic, dingbat, odder, crazed, silly, cuckoo, nuttiest, loco, brainsick, violent, oddest, freakier, absurd, wackiest, flaky, rabid, dippy, potty, silliest, nuttier, smoking, wacko, barmy, sappier, bonkers, freakish, foolish, pottier, camer, zonkers, athrill, rummier, kookier, wackier, touched, goofier, ape, jokey, berserk

3 Syllables

erratic, flipped-out, off-the-wall, psychotic, half-baked, lunatic, senseless, half-cracked, novelties, unhinged, overwrought, overboard, demented, eccentric, squirrelly, lamebrain, insane, maniacal, fanatic, softheaded, fantastic, overstrung, fruitcake, novelty, idiotic, ecstatic, deranged, lamebrains, jocular, unzipped, unbridled, mind-changing, ludicrous, delirious, recentness, hare-brained

4 Syllables

irrational, preposterous, extravagant, harebrained, corybantic, cockamamy, modernity, muddleheaded, certifiable, unreasoning, cockamamie, hysterical, unorthodox, psychopathic, schizophrenic, fantastical, psychedelic, newfangledness, mind-expanding, psychoactive, psychotropic, imbecilic, unbalanced, bedlamite

5 Syllables

unconventional, unmanageable

6 Syllables

manic-depressive, innovativeness, consciousness-expanding, hallucinogenic, psychotomimetic