frail·ty /ˈfre(ə)lti/
  弱點,脆弱
  frail·ty n.; pl. frailties
  1. The condition or quality of being frail, physically, mentally, or morally; frailness; infirmity; weakness of resolution; liableness to be deceived or seduced.
     God knows our frailty, [and] pities our weakness.   --Locke.
  2. A fault proceeding from weakness; foible; sin of infirmity.
  Syn: -- Frailness; fragility; imperfection; failing.
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  frailty
       n 1: the state of being weak in health or body (especially from
            old age) [syn: infirmity, debility, feebleness, frailness]
       2: moral weakness [syn: vice]