Definition of formidable adjective from the Oxford Advanced Learner's Dictionary

 

formidable

 adjective
adjective
BrE BrE//ˈfɔːmɪdəbl//
 
; NAmE NAmE//ˈfɔːrmɪdəbl//
 
; BrE BrE//fəˈmɪdəbl//
 
; NAmE NAmE//fərˈmɪdəbl//
 
Fear
 
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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. See related entries: Fear Word Origin late Middle English: from French, or from Latin formidabilis, from formidare ‘to fear’.
See the Oxford Advanced American Dictionary entry: formidable