Usage Note
Traîtresse is the feminine form of traître. It can function as both noun and adjective: une boisson traîtresse means a deceptively strong drink. The adjective sense is more common than the noun sense today, and the phrase en traître ('treacherously, by stealth') derives from the masculine noun.
Examples
"La foule la traitait de traîtresse."
Natural Translation
The crowd called her a traitoress.

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