traitress

[ trey-tris ]

/ ˈtreɪ trɪs /

a woman who is a traitor.

Also trai·tor·ess

[trey-ter-is] /ˈtreɪ tər ɪs/.

Origin of traitress

1400–50; late Middle English traitresse < Old French; see traitor, -ess

But the Genie said, 'Nay, there will come a time for that, traitress!'

The Shaving of Shagpat, Complete |George Meredith
Ah, traitress; and thou art gone too; but I'll catch thee—thou shalt smart for this!'

The Last Days of Pompeii |Edward George Bulwer-Lytton
So she had deceived him, after all; she had played the traitress from the very beginning.

The Doomsman |Van Tassel Sutphen
The traitress displayed such cleverness that, before long, Tyltyl's disobedience became a very fine thing in his own eyes.

The Blue Bird for Children |Georgette Leblanc

The image of Vittoria, the traitress, floated over the soldiery marching on Milan through her treachery.

Vittoria, Complete |George Meredith