Synonyms of loony

Noun

1. crazy, loony, looney, nutcase, weirdo, lunatic, madman, maniac

usage: someone deranged and possibly dangerous

Adjective

1. balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky, insane (vs. sane)

usage: informal or slang terms for mentally irregular; "it used to drive my husband balmy"

Definition and meaning of loony (Dictionary)