tetch·y also
tech·y 
(t
ĕch
ē)
adj. tetch·i·er,
tetch·i·est also
tech·i·er or
tech·i·est Peevish; testy: "As a critic gets older, he or she usually grows more tetchy and limited in responses" (James Wolcott).
[Probably from Middle English tache, teche, blemish (influenced by TOUCHY), from Old French tache, teche, from Vulgar Latin *tacca, from Gothic taikns, sign; see deik- in the Appendix of Indo-European roots.]
tetchi·ly adv.
tetchi·ness n.