Entry 1 sense Webster, 1913 Testy /tĕs'-tē/ · Tes·ty · IPA /ˈtɛsti/ 01 a. Fretful; peevish; petulant; easily irritated. 1. Fretful; peevish; petulant; easily irritated. “Must I observe you? must I stand and crouch Under your testy humor?” — Shak. “I was displeased with myself; I was testy.” — Latimer.