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Adjective: redoubtable  ri'daw-tu-bul
  1. Inspiring fear
    "a tougher and more redoubtable adversary than the heel-clicking, jackbooted fanatic";
    - formidable, unnerving, doubtable [archaic]
  2. Worthy of respect or honour
    "born of a redoubtable family"

See also: alarming, reputable

Encyclopedia: Redoubtable