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Webster 1913 Edition

Noun.

The quality or state of being testy; fretfulness; petulance.

Testiness

is a disposition or aptness to be angry.

Locke.

Noun.

[from testy.] Fretfulness; peevishness; petulance.

Testiness is a disposition or aptness to be angry.

testiness ‎(usually uncountable, plural testinesses)