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formidable

adjective
 
 
/fɔːˈmɪ.də.bl̩/ US  /fɔːr-/

Definition

C2 causing you to have fear or respect for something or someone because they are large, powerful, or difficult: a formidable obstacle/task a formidable adversary/enemy/opponent a formidable intellectdisapproving the director and his formidable wifeComplicated and difficult to doDifficult to understand formidably
 
 
/-bli/ adverb
Complicated and difficult to doDifficult to understand
(Definition of formidable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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