irritable irritable /ˈɪrətəbəl/

adjective

1. () Easily irritated or annoyed  ( cranky [Informal] , fractious , nettlesome , peckish [Informal, N. American] , pettish , petulant , scratchy , techy , testy , irritable , peevish , tetchy , narky [British, Slang] , pouty )
   easily irritated or annoyed
    An incorrigibly fractious young man
   an incorrigibly fractious young man
    Not the least nettlesome of his countrymen
   not the least nettlesome of his countrymen
   
2. (physiology) capable of responding to stimuli  ( excitable , irritable )
   (physiology) capable of responding to stimuli
   
3. (pathology) abnormally sensitive to a stimulus  ( irritable )
   (pathology) abnormally sensitive to a stimulus