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Arousing fear, dread, or alarm: the formidable prospect of major surgery.
(adjective)
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Inspiring awe, admiration, or wonder: "Though a true hero, he was also a thoroughgoing bureaucrat and politician, a formidable combination” ( Mario Puzo).
(adjective)
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Difficult to undertake, surmount, or defeat: a formidable challenge; a formidable opponent.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.