Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

1. Abnormal sensitivity or excessive responsiveness, as of an organ or body part, to a stimulus. 2. It is a state of excessive, easily provoked anger, annoyance or impatience, see neural irritability.

IRRITABILITY: "Irritability is annoyance, excessive and easily- provoked anger and excessive responsiveness."

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