pert
From LSJ
Ποιητὴς, ὁπόταν ἐν τῷ τρίποδι τῆς Μούσης καθίζηται, τότε οὐκ ἔμφρων ἐστίν → Whenever a poet is seated on the Muses' tripod, he is not in his senses
P. ὑβριστικός, Ar. and V. νεανικός, P. and V. θρασύς.
be pert, v.:Ar. and P. νεανιεύεσθαι.