in·cul·pa·ble /(ˌ)ɪnˈkʌlpəbəl/
  (a.)不能限害的,無辜的,無可非議的
  In·cul·pa·ble a.  Faultless; blameless; innocent.
     An innocent and incupable piece of ignorance.   --Killingbeck.
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  inculpable
       adj : free of guilt; not subject to blame; "has lived a blameless
             life"; "of irreproachable character"; "an unimpeachable
             reputation" [syn: blameless, irreproachable, unimpeachable]