The Collaborative International Dictionary of English v.0.48:

Antic \An"tic\, v. i.
   To perform antics.
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The Collaborative International Dictionary of English v.0.48:

Antic \An"tic\ ([a^]n"t[i^]k), a. [The same word as antique; cf.
   It. antico ancient. See Antique.]
   1. Old; antique. (Zool.) "Lords of antic fame." --Phaer.
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   2. Odd; fantastic; fanciful; grotesque; ludicrous.
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            The antic postures of a merry-andrew. --Addison.
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            The Saxons . . . worshiped many idols, barbarous in
            name, some monstrous, all antic for shape. --Fuller.
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The Collaborative International Dictionary of English v.0.48:

Antic \An"tic\, n.
   1. A buffoon or merry-andrew; one that practices odd
      gesticulations; the Fool of the old play.
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   2. An odd imagery, device, or tracery; a fantastic figure.
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            Woven with antics and wild imagery.   --Spenser.
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   3. A grotesque trick; a piece of buffoonery; a caper.
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            And fraught with antics as the Indian bird
            That writhes and chatters in her wiry cage.
                                                  --Wordsworth.
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   4. (Arch.) A grotesque representation. [Obs.]
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   5. An antimask. [Obs. or R.]
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            Performed by knights and ladies of his court
            In nature of an antic.                --Ford.
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The Collaborative International Dictionary of English v.0.48:

Antic \An"tic\, v. t. [imp. & p. p. Anticked, Antickt.]
   To make appear like a buffoon. [Obs.] --Shak.
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The Collaborative International Dictionary of English v.0.48:

Antique \An*tique"\, a. [F., fr. L. antiquus old, ancient,
   equiv. to anticus, from ante before. Cf. Antic.]
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   1. Old; ancient; of genuine antiquity; as, an antique statue.
      In this sense it usually refers to the flourishing ages of
      Greece and Rome.
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            For the antique world excess and pride did hate.
                                                  --Spenser.
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   2. Old, as respects the present age, or a modern period of
      time; of old fashion; antiquated; as, an antique robe.
      "Antique words." --Spenser.
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   3. Made in imitation of antiquity; as, the antique style of
      Thomson's "Castle of Indolence."
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   4. Odd; fantastic. [In this sense, written antic.]
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   Syn: Ancient; antiquated; obsolete; antic; old-fashioned;
        old. See Ancient.
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WordNet (r) 3.0 (2006):

antic
    adj 1: ludicrously odd; "Hamlet's assumed antic disposition";
           "fantastic Halloween costumes"; "a grotesque reflection
           in the mirror" [syn: antic, fantastic, fantastical,
           grotesque]
    n 1: a ludicrous or grotesque act done for fun and amusement
         [syn: antic, joke, prank, trick, caper, put-on]
    v 1: act as or like a clown [syn: clown, clown around,
         antic]