WACK is validvalid

very bad [adj WACKER, WACKEST] / a wacky person [n WACKS]

5,150 of 196,601 in NWL2023·also valid in CSW24

crazy, also WACKY [adj WACKER, WACKEST] / an eccentric, mad, or crazy person; a crackpot, also WACKO, WHACKO [n -S]