Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Anglo-French
Origin: testif 'determined to do what you want', from Old French teste 'head'

testy

adjective
     
tes‧ty
impatient and easily annoyed [= irritable]:
testy remarks
It had been a long day, and Sarah was getting a little testy.
testily adverb
testiness noun [uncountable]

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