redoubtable

  1. adjective
    inspiring fear; "the formidable prospect of major surgery"; "a tougher and more redoubtable adversary than the heel-clicking, jackbooted fanatic"- G.H.Johnston; "something unnerving and prisonlike about high gray wall"
  2. adjective
    having or worthy of pride; "redoubtable scholar of the Renaissance"; "born of a redoubtable family"