japery n 1: acting like a clown or buffoon [syn: {buffoonery}, {clowning}, {japery}, {frivolity}, {harlequinade}, {prank}]
Japery \Jap"er*y\, n. [Cf. OF. japerie a yelping.] Jesting; buffoonery. [Obs.] --Chaucer. [1913 Webster]