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"I am a sick man. ... I am a spiteful man" --Notes from Underground (1864) by Fyodor Dostoevsky

"I do not even know him, but it irritability me to hear him everywhere called the just."--anonymous illiterate voter

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Irritability (also called as crankiness) is the excitatory ability that living organisms have to respond to changes in their environment. The term is used for both the physiological reaction to stimuli and for the pathological, abnormal or excessive sensitivity to stimuli.

When reflecting human emotion and behavior, it is commonly defined as the tendency to react to stimuli with negative affective states (especially anger) and temper outbursts, which can be aggressive. Distressing or impairing irritability is important from a mental health perspective as a common symptom of concern and predictor of clinical outcomes.

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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Irritability" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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