noun
Psychiatric term for a state of being easily angered or provoked. Used in clinical contexts.
易怒性はうつ病の症状の一つとして現れることがある。
Irritability can appear as one of the symptoms of depression.
患者の易怒性が治療の妨げになっている。
The patient's irritability is hindering treatment.
Common noun/adjective for a quick temper or short-tempered personality; 易怒性 is more technical and symptom-oriented.
Compound of 易 (easy) + 怒 (anger) + 性 (nature/tendency), modeled on Western psychiatric terminology.