zany

[1]	fathead , clown , comic , goof , goofball , jester , fool , bozo , jackass , joker , buffoon , goose , cuckoo , wag , comedian , twat , merry andrew , laughing-stock , (Slang) nut , (US) screwball

adj.

[1]	clownish , mad , wild , frolicsome , sportive , playful , gay , merry , slapstick , crazy , funny , comic(al) , amusing , hilarious , absurd , nonsensical , ludicrous , silly , foolish , inane , (Colloq) wacky , loony , madcap , crackpot , nutty , goofy , (US) kooky
[2]	cockamamie , cockamamy , goofy , sappy , silly , wacky , whacky
[3]	buffoonish , clownish , clownlike