ir·re·proach·able /-ˈproʧəbəl/
  (a.)不可非難的,無缺點的,無過失的
  Ir·re·proach·a·ble a.  Not reproachable; above reproach; not deserving reproach; blameless.
     He [Berkely] erred, -- and who is free from error? -- but his intentions were irreproachable.   --Beattie.
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  irreproachable
       adj : free of guilt; not subject to blame; "has lived a blameless
             life"; "of irreproachable character"; "an unimpeachable
             reputation" [syn: blameless, inculpable, unimpeachable]