villainess

[ vil-uh-nis ]

/ ˈvɪl ə nɪs /

a villainous woman.

Origin of villainess

First recorded in 1580–90; villain + -ess

See -ess.

Jackson was cast as the villainess—the “mastermind” of this whole bloated controversy.

Super Bowl’s ‘Nipplegate’ Fiasco 10 Years Later: The Pop Diva, the Boob, and the Outrage |Marlow Stern |February 1, 2014 |DAILY BEAST
Thus we took up our parts of (alleged) villain and villainess.

The Heather-Moon |C. N. Williamson and A. M. Williamson
And the heart-beats were not calmed, for Marise recognised the contralto tones of Miss Marks, the villainess of her dream.

Vision House |C. N. Williamson
Of course these matters may be important—if the lady is the villainess, for instance.

The Lure of the Pen |Flora Klickmann

If the villainess were a blonde, the gallery would take her for the heroine, and things would get terribly mixed.

Her Royal Highness Woman |Max O'Rell
She told him he was making a villainess out of her, and that she'd end their meetings.

The Precipice |Elia Wilkinson Peattie