American English

Definition of formidable adjective from the Oxford Advanced American Dictionary

 

formidable

 adjective
adjective
NAmE//ˈfɔrmədəbl//
 
, NAmE//fərˈmɪdəbl//
 
 
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if people, things, or situations are formidable, you feel fear and/or respect for them, because they are impressive or powerful, or because they seem very difficult In debate he was a formidable opponent. Somehow the small but formidable woman fought her way through the crowd to reach her son. She has a formidable list of qualifications. The two players together make a formidable combination. The task was a formidable one. They had to overcome formidable obstacles.
NAmE//ˈfɔrmədəbli//
 
, NAmE//fərˈmɪdəbli//
 
adverb He now has the chance to prove himself in a formidably difficult role. She's formidably intelligent.
See the Oxford Advanced Learner's Dictionary entry: formidable