zany

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Comical or ludicrous because of incongruity or strangeness.
• noun A comical person given to extravagant or outlandish behavior.
• noun A ludicrous, buffoonish character in old comedies who attempts feebly to mimic the tricks of the clown.

from The Century Dictionary.

• To play the zany to; mimic; imitate apishly.
• noun A comic performer, originating on the Italian stage, whose function it is to make awkward attempts at mimicking the tricks of the professional clown, or the acts of other performers; hence, an apish buffoon in general; a merry-andrew; an amusing fool.
• noun . An attendant.
• noun Synonyms Clown, Fool, Buffoon, Mimic, Zany. “The zany in Shakespere's day was not so much a buffoon and mimic as the obsequious follower of a buffoon and the attenuated mime of a mimic. He was the vice, servant, or attendant of the professional clown or fool, who, dressed like his master, accompanied him on the stage or in the ring, following his movements, imitating his tricks. and adding to the general merriment by his ludicrous failures and comic imbecility … The professional clown or fool might be clever and accomplished in his business, a skilful tumbler and mountebank, doing what he undertook to do thoroughly and well. But this was never the case with the zany. He was always slight and thin, well-meaning, but comparatively helpless, full of readiness, grimace, and alacrity, but also of incompetence. eagerly trying to imitate his superior, but ending in failure and absurdity … We have ourselves seen the clown and the zany in the ring together, the clown doing clever tricks, the zany provoking immense laughter by his ludicrous failures in attempting to imitate them. Where there is only a single clown. he often combines both the characters, doing skilful tumbling on his own account, and playing the zany to the riders.” (Edinburgh Rev., July, 1869, art. 4.)

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb obsolete To mimic.
• noun A merry-andrew; a buffoon.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective ludicrously or incongruously comical
• adjective bizarre, clownish
• noun obsolete A fool or clown.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a man who is a stupid incompetent fool
• adjective like a clown
• noun a buffoon in one of the old comedies; imitates others for ludicrous effect
• adjective ludicrous, foolish