adjective, testier, testiest.
irritably impatient; touchy.

1325–75; late Middle English testi, alteration of Middle French testu headstrong; replacing Middle English testif < Middle French. See test2, -ive

testily, adverb
testiness, noun

tetchy, edgy, snappish, cross, irascible. See irritable.

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World English Dictionary
testy (ˈtɛstɪ)
adj , -tier, -tiest
irritable or touchy
[C14: from Anglo-Norman testif headstrong, from Old French teste head, from Late Latin testa skull, from Latin: shell]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1510, "impetuous, rash," from M.E. testif "headstrong" (late 14c.), from Anglo-Fr. testif, from O.Fr. testu "stubborn," lit. "heady," from teste "head," from L.L. testa "skull," in L. "pot, shell" (see tester (2)). Meaning "easily irritated" is first recorded 1526.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Unstable weather patterns can play havoc with food production, and hungry
  people tend to get pretty testy.
Until that moment he had been intensely focused on the crisis and had been
  steady, although testy and combative.
The choice was meant to soothe her party's bigwigs, with whom she has a
  sometimes testy relationship.
We have one customer with whom our relationship, though not vitriolic, is testy
  or chippy.
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