im·pec·ca·ble /(ˌ)ɪmˈpɛkəbəl/
 (a.)無懈可擊的,無缺點的,無瑕疵的,不會做壞事的
 Im·pec·ca·ble a.  Not liable to sin; exempt from the possibility of doing wrong. -- n. One who is impeccable; esp., one of a sect of Gnostic heretics who asserted their sinlessness.
    God is infallible, impeccable, and absolutely perfect.   --P. Skelton.
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 impeccable
      adj 1: without fault or error; "faultless logic"; "speaks
             impeccable French"; "timing and technique were
             immaculate"; "an immaculate record" [syn: faultless,
              immaculate]
      2: not capable of sin