irritability

(ĭrˌĭ-tə-bĭlˈĭ-tē)

noun pl. ir·ri·ta·bil·i·ties
  1. The quality or state of being irritable; testiness or petulance.
  2. Pathology Abnormal or excessive sensitivity of a body organ or part to a stimulus.
  3. Physiology The capacity to respond to stimuli.

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