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Related to irascibleness: irritableness
1. Prone to outbursts of temper; easily angered.
2. Characterized by or resulting from anger.
[Middle English, from Old French, from Late Latin īrāscibilis, from Latin īrāscī, to be angry, from īra, anger; see eis- in Indo-European roots.]
i·ras′ci·bil′i·ty, i·ras′ci·ble·ness n.