round the bend(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, wacky, whacky - informal or slang terms for mentally irregular; "it used to drive my husband balmy"