whacky

Adjective whacky has 2 senses

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