[adj] informal or slang terms for mentally irregular; "it used to drive my husband balmy"
[adj] (informal terms) "gave me a cockamamie reason for not going"; "wore a goofy hat"; "a silly idea"; "some wacky plan for selling more books"
Synonyms
around the bend, balmy, barmy, bats, batty, bonkers, buggy, cockamamie, cockamamy, cracked, crackers, daft, dotty, fool(a), foolish, fruity, goofy, haywire, insane, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, sappy, silly, unreasonable