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formidable

 
/ˈfɔr·mɪ·də·bəl/, /fɔrˈmɪd·ə-/, /fərˈmɪd-/ adj

Definition

strong and powerful, and therefore difficult to deal with if opposed to you: There were formidable obstacles to reaching an early settlement of the dispute.
(Definition of formidable adj from the Cambridge Academic Content Dictionary © Cambridge University Press)

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