n.虚弱；病身；疾病；弱点
Infirmity often comes with old age. 虚弱常随年老而来。
The old woman was suffering from age and infirmity. 那个老妇人受年老体弱之苦。
Having a bad temper is his worst infirmity. 坏脾气是他最大的弱点。
