Psychiatric term for a state of being easily angered or provoked. Used in clinical contexts.
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.