GNU Collaborative International Dictionary of English

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1.       
   Testy , a. [Compar. Testier ; superl. Testiest.] [OF. testu obstinate, headstrong, F. têtu, fr. OF. teste the head, F. tête. See Test a cupel.] Fretful; peevish; petulant; easily irritated.
   1913 Webster
   Must I observe you? must I stand and crouch
   Under your testy humor?
   Shak.
   
   1913 Webster
   I was displeased with myself; I was testy.
   Latimer.
   
   1913 Webster