loon Synonyms

diver lunatic addle-head wacko madman maniac psycho birdbrain knucklehead twit weirdo loonie goon madwoman fruitcake mental case nutcase wittol looney pinhead addlehead dumbbell dope boob kook bonehead psychopath sociopath dork lamebrain nutbag schizo sociopathic twerp odd one crazy person deranged person numbskull halfwit dingbat oddball nitwit dimwit crackpot nut case screwball whacko bulb-out chowderhead simpleton