They face formidable challenges. Times, Sunday Times (2016)The concert he's talking about is a formidable challenge for a man who's been learning the piano for less than two years. Times, Sunday Times (2013)This is a formidable challenge for historians, because the technical difficulties of studying past migrations are imposing. Migrants in Modern France: Population Mobility in the Later Nineteenth and Twentieth Centuries (1989)
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Definition of formidable challenge from the Collins English Dictionary
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