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irritable (adj.)

1660s, "susceptible to mental irritation," from French irritable and directly from Latin irritabilis "easily excited," from irritare "excite, provoke" (see irritate). Meaning "responding quickly to a stimulus" is from 1791. Related: Irritably.

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Definitions of irritable from WordNet

irritable (adj.)
abnormally sensitive to a stimulus;
irritable (adj.)
capable of responding to stimuli;
Synonyms: excitable
From wordnet.princeton.edu