petulant
1. [ adjective ] easily irritated or annoyed
Synonyms: irritable peevish nettlesome techy fractious pettish testy tetchy peckish cranky
Examples:

"an incorrigibly fractious young man" "not the least nettlesome of his countrymen"

Related terms: ill-natured
Similar spelling:   petulantly
  petulance
  Pedilanthus