Synonyms of whacko

1 Syllable

daft, fried

2 Syllables

crazed, kooky, dafter, bonkers, schizoid, screwy, daftest, foolish, loco, schizzo, zany, stupid, balmy, nutty, maniac, absurd, cracked, flaky, baked, dippy, unsound

3 Syllables

bananas, psychotic, insane, maniacal, lunatic, idiotic, demented, deranged, crackbrained

4 Syllables

irrational, nonsensical, preposterous