'Japery' definitions:

Definition of 'japery'

(from WordNet)
noun
Acting like a clown or buffoon [syn: buffoonery, clowning, japery, frivolity, harlequinade, prank]

Definition of 'Japery'

From: GCIDE
  • Japery \Jap"er*y\, n. [Cf. OF. japerie a yelping.] Jesting; buffoonery. [Obs.] --Chaucer. [1913 Webster]