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Adjective: unimpeachable  ,ún-im'pee-chu-bul
  1. Beyond doubt or reproach
    "an unimpeachable source"
  2. Free of guilt; not subject to blame
    "an unimpeachable reputation";
    - blameless, inculpable, irreproachable
  3. Completely acceptable; not open to exception or reproach
    "two unimpeachable witnesses";
    - unexceptionable

See also: acceptable, clean-handed, guiltless, innocent, unquestionable