formidable

Adjective
  1. Extremely impressive in strength or excellence (synset 301287928)
    "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"
    similar to: impressive - making a strong or vivid impression
  2. Inspiring fear (synset 300196975)
    "the formidable prospect of major surgery"; "a tougher and more redoubtable adversary than the heel-clicking, jackbooted fanatic"; "something unnerving and prisonlike about high grey wall"
    similar to: alarming - frightening because of an awareness of danger
    same as: redoubtable, unnerving

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