Webster’s Revised Unabridged Dictionary · 1913
Jackanapes
Jack′a·napes (jăk′ȧ·nāps′), n. [For Jack o' (= of) apes; prop., a man who exhibits apes.] [Written also jackanape.]
1. A monkey; an ape. Shak.
2. A coxcomb; an impertinent or conceited fellow.
A young upstart jackanapes. Arbuthnot.