Habitually fretful; easily vexed or fretted; hard to please; apt to complain; querulous; petulant.

Expressing fretfulness and discontent, or unjustifiable dissatisfaction; as, a peevish answer.

easily irritated or annoyed; "an incorrigibly fractious young man"; "not the least nettlesome of his countrymen"

Silly; childish; trifling.