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formidable

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adjective American English pronunciation: formidable /ˈfɔrmɪdəb(ə)l/ American English pronunciation: formidable /fərˈmɪdəb(ə)l/
  1. very impressive in size, power, or skill and therefore deserving respect and often difficult to deal with

    Meeting the energy demands of a big city is a formidable task.

    The company has built up a formidable reputation for quality.

    a formidable opponent/challenge

derived word

formidably

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