petulant

adjective2

1. •
   Childishly irritable.

   • Lack of sleep is causing Dave's recent petulant behavior.
2. •
   (no longer used) Forward; pert; insolent; wanton.

   • Who hath not like cause to complain, and is not so troubled, that shall fall into the mouths of such men? for many are of so petulant a spleen — 1624