Entry 2 senses Webster, 1913 Jackanapes · Jack·a·napes · IPA /ˈd͡ʒækəˌneɪps/ 01 n. A monkey; an ape. 1. A monkey; an ape. 2. A coxcomb; an impertinent or conceited fellow. “A young upstart jackanapes.” — Arbuthnot.