The Oxford Thesaurus An A-Z Dictionary of Synonyms - zanyadj.

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: The buskers put on the zaniest show I have seen for some time. --n. 2) clown, comic, jester, fool, joker, buffoon, wag, comedian, merry andrew, laughing-stock, Slang nut, US screwball: The two zanies kept the crowd in stitches while the pickpockets stole their wallets.