noun
A man who readily or frequently enters into casual sexual relationships with women; a womanizer.
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The media exposed him as a notorious philanderer, having multiple extramarital affairs.
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Everyone knew he was a philanderer, always flirting with different women at the office.
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He's such a player, a real philanderer who can't stay faithful to one person.
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His wandering eye and flirtatious nature earned him the reputation of a philanderer in social circles.