Someone dangerous who pretends to be harmless.
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Someone or something dangerous that appears kind and harmless.
A wolf in sheep's clothing hides bad intentions behind a friendly surface, so people trust it before they understand it.
The phrase comes from one of Aesop's fables and carries a clear warning.
"Snake in the Grass"
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A hidden betrayer inside your own circle
"Too Good to Be True"
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Suspiciously good, probably a trick
"A Wolf in Sheep's Clothing"
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Dangerous behind a harmless appearance