/ ˈfreɪlti; NAmE / noun ( pl. -ies )
1.
[ U ] weakness and poor health :
Increasing frailty meant that she was more and more confined to bed.
2.
[ U , C ] weakness in a person's character or moral standards :
human frailty
the frailties of human nature
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WORD ORIGIN
Middle English (in the sense weakness in morals ): from Old French frailete , from Latin fragilitas , from fragilis , from frangere to break.