irritable
adj.
easily irritated or annoyed
an incorrigibly fractious young man|not the least nettlesome of his countrymen
Synonym: cranky, tetchy, testy, techy, scratchy, petulant, pettish, peevish, peckish, nettlesome, fractious
adj.
abnormally sensitive to a stimulus
adj.
capable of responding to stimuli
Synonym: excitable