Source : WordNet®

tetchy
     adj : easily irritated or annoyed; "an incorrigibly fractious
           young man"; "not the least nettlesome of his
           countrymen" [syn: {cranky}, {fractious}, {irritable}, {nettlesome},
            {peevish}, {peckish}, {pettish}, {petulant}, {testy},
           {techy}]
     [also: {tetchiest}, {tetchier}]

tetchier
     See {tetchy}