Synonyms of insane

1 Syllable

daft, mad, nuts, wild

2 Syllables

wacky, schizoid, amok, apest, ranting, mental, raging, loony, batty, cracked, moonstruck, loopy, frenzied, furious, mad-dog, ultraist, gonzo, madding, tomfool, crackpot, crazier, screwy, nutty, craziest, sappy, frantic, clocker, battiest, crazy, battier, crazed, dafter, cuckoo, nuttiest, daftest, aper, whacko, wackiest, rabid, dippy, unsound, nuttier, smoking, loonier, sappier, raving, manic, foolish, fatuous, zonkers, wackier, touched, berserk

3 Syllables

flipped-out, off-the-wall, psychotic, unsettled, unbacked, ireful, lunatic, senseless, haywire, bizarre, unhinged, paranoid, overboard, demented, squirrelly, maniacal, softheaded, fantastic, unscrewed, idiotic, demonic, possessed, deranged, derailed, delirious, hare-brained, frenetic, furibund

4 Syllables

irrational, preposterous, impractical, corybantic, certifiable, unreasoning, cockamamie, psychopathic, schizophrenic, imbecilic, bedlamite, demoniacal

5 Syllables

irresponsible

6 Syllables

manic-depressive