frailty
/ˈfreɪltɪ/noun
(pl. -ies)［mass noun］
1- the condition of being weak and delicate脆弱; 虚弱：
the increasing frailty of old age.
晚年渐增的虚弱。
1.1
- weakness in character or morals（性格、品德上的）弱点：
all drama begins with human frailty
所有的戏剧都始于人性的弱点
count noun you're too self-righteous to see your own frailties.你太自以为是以至于看不到自己的弱点。
词源
Middle English （in the sense 'weakness in morals'）： from Old French frailete, from Latin fragilitas, from fragilis （see FRAGILE）.