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Definitions of zany:

noun:   a buffoon in one of the old comedies; imitates others for ludicrous effect
noun:   a man who is a stupid incompetent fool
adjective:   like a clown
Example: "A zany sense of humor"

adjective:   pungent adjectives of disesteem

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Alternative Terms
clown comedian comic farceur funnyman humorist jester joker jokester quipster wag wit card laughter-similar-words amusing droll funny humorous laughable risible absurd foolish harebrained idiotic imbecilic insane lunatic mad moronic nonsensical preposterous silly softheaded tomfool unearthly cockeyed crazy loony loopy balmy dippy dopey jerky sappy wacky ability-inability knowledge-ignorance cynical ambrose-bierce zanyism ernie-kovacs zany-life-crazy-faith zany-life-plus-crazy-faith hellzapoppin alan-arkin joe-cook lou-holtz olsen-and-johnson the-monkees jenneting larky jerry-lewis ole-olsen