1. (

• cranky ,
• fractious ,
• irritable ,
• nettlesome ,
• peevish ,
• peckish ,
• pettish ,
• petulant ,
• scratchy ,
• testy ,
• tetchy ,
• techy

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

2. (

• irritable ,

) abnormally sensitive to a stimulus ;

3. (

• excitable ,
• irritable ,

) capable of responding to stimuli ;