Adjective formidable has 2 senses
  1. formidable - 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"
    Antonym:
    unimpressive (indirect, via impressive)
  2. formidable, redoubtable, unnerving - 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"
    Antonym: unalarming (indirect, via alarming)
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