Petulant, a.
Etymology: [L. petulans, -antis, prop., making slight attacks upon, from a lost dim. of petere to fall upon, to attack: cf. F. pétulant. See Petition.]
1. Forward; pert; insolent; wanton. [Obs.] Burton.
2. Capriciously fretful; characterized by ill-natured freakishness; irritable. "Petulant moods." Macaulay.
Syn. -- Irritable; ill-humored; peevish; cross; fretful; querulous.