Synonyms of loony

1 Syllable

schtick, daft, mad, nuts, maer, gump

2 Syllables

wacky, kooky, zaniest, madder, mental, berserk, batty, maniac, cracked, moonstruck, loopy, psycho, boffo, daffy, jollying, tomfool, jovial, morons, screwy, screwball, witless, festal, dement, nutty, maddest, sappy, dingbat, moron, crazed, silly, cuckoo, zanier, dottier, nuttiest, loco, zany, absurd, wackiest, flaky, potty, nuttier, barmy, dotty, sappier, bonkers, foolish, pottier, wackier, goofus, touched, ape, fooler

3 Syllables

off-the-wall, lunatic, nutcase, demented, comical, insane, maniacal, softheaded, madperson, deranged, fool-headed, delirious, hare-brained

4 Syllables

irrational, harebrained, cockamamy, unreasoning, cockamamie, schizophrenic, conversable, addlepate, lamebrained, imbecilic, unbalanced, bedlamite

5 Syllables

unreflective