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Adjective: formidable  for-mi-du-bul or for'mi-du-bul or fu(r)'mi-du-bul
  1. Extremely impressive in strength or excellence
    "a formidable opponent"; "the challenge was formidable"; "had a formidable array of compositions to his credit"; "the formidable army of brains at the Prime Minister's disposal"
  2. Inspiring fear
    "the formidable prospect of major surgery";
    - redoubtable, unnerving, doubtable [archaic]

See also: alarming, impressive

Encyclopedia: Formidable