neg·li·gi·ble /ˈnɛglɪʤəbəl/
  (a.)可以忽略的,不足取的,無用的
  Neg·li·gi·ble a.  That may be neglected, disregarded, or left out of consideration; too small or unimportant to be worthy of notice.
     Within very negligible limits of error.   --Sir J. Herschel.
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  negligible
       adj 1: so small as to be meaningless; insignificant; "the effect
              was negligible"
       2: not worth considering; "he considered the prize too paltry
          for the lives it must cost"; "piffling efforts"; "a
          trifling matter" [syn: paltry, trifling]