feebleness
  弱,微弱
  Fee·ble·ness, n. The quality or condition of being feeble; debility; infirmity.
     That shakes for age and feebleness.   --Shak.
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  feebleness
       n 1: the state of being weak in health or body (especially from
            old age) [syn: infirmity, frailty, debility, frailness]
       2: the quality of lacking intensity or substance; "a shrill yet
          sweet tenuity of voice"- Nathaniel Hawthorne [syn: tenuity]