Synonyms of cockamamy

1 Syllable

mad, dumb

2 Syllables

wacky, tomfool, kooky, dotty, silly, foolish, witless, zany, stupid, loony, doltish, nutty, absurd, loopy, brainless, mindless, daffy, jerky, crazy

3 Syllables

birdbrained, softheaded, half-baked, lunatic, senseless, idiotic, unwise, ludicrous, moronic, half-witted

4 Syllables

irrational, ill-advised, ridiculous, nonsensical, harebrained, asinine, feebleminded

5 Syllables

unintelligent