Someone who is insincere or deceitful, presenting a different appearance to different people.
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Friendly to your face, different behind your back.
A two-faced person says one thing and does another.
You cannot trust them, because you never see the same side twice.
"Backstabber"
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Someone who betrays your trust after appearing to be your ally
"Hypocrite"
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A person who says one thing but does the opposite in their own behavior
"Two-faced"
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Acting friendly to someone's face while behaving dishonestly behind their back