devil in disguise

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devil in disguise

Something or someone that appears to be good, useful, or benevolent, but that in reality proves to be the opposite. When I first met my ex-husband, I thought he was the nicest, most generous man alive, but he turned out to be the devil in disguise. The new cancer-treating drug held great promise, but it proved a devil in disguise when the true scale of its side effects became known.
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Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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