Overview of noun loony

The noun loony has 1 sense

• crazy, loony, looney, nutcase, weirdo -- (someone deranged and possibly dangerous)

Overview of adj loony

The adj loony has 1 sense

• 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 -- (informal or slang terms for mentally irregular; "it used to drive my husband balmy")