The Collaborative International Dictionary of English v.0.48:

Tetchy \Tetch"y\, a.
   See Techy. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tetchy
    adj 1: 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, scratchy,
           testy, tetchy, techy]