Synonyms of idiotic

1 Syllable

daft, dumb, dull, maer

2 Syllables

tomfool, dopier, silly, sappier, sillier, dafter, crazier, schizoid, daftest, goofy, foolish, pottier, fatuous, loco, witless, stupid, whacko, batty, oafish, dopey, craziest, absurd, gawkish, moonstruck, goofier, loopy, sappy, mindless, dippy, daffy, potty, silliest, crazy

3 Syllables

frivolous, stupidest, light-minded, birdbrained, nonserious, thickheaded, inanest, insane, nitwitted, softheaded, foolhardy, half-baked, lunatic, senseless, cretinous, inane, blunderous, lubberly, dim-witted, demented, moronic, thick-headed, crackbrained, squirrelly, thick-witted

4 Syllables

schizophrenic, imbecilic, muddleheaded, imbecile, harebrained, asinine, simpleminded, cockamamy

5 Syllables

unintelligent, butterfingered