false-hearted

So all pitied the poor Vicar, despised his uppish, false-hearted wife, and most hated the young squire.

From The Life of Thomas Wanless, Peasant by Alexander Johnstone Wilson

So Mr. Robert M'Gillies was consigned to his own lamentations in the dreary dungeons of Tothill-fields' Bridewell, and the false-hearted Julia Cob returned to her new lover in Norfolk-street.

From Mornings at Bow Street A Selection of the Most Humorous and Entertaining Reports which Have Appeared in the 'Morning Herald' by John Wight

Yes, Florence," said her friend, "he is false-hearted.

From The Home Mission by T. S. (Timothy Shay) Arthur

It was that false-hearted woman gave you these precious maxims.

From One Of Them by Charles James Lever

I'll go back to the Western land, I'll hunt up my old cowboy band,— Where the girls are few and the boys are true And a false-hearted love I never knew.

From Cowboy Songs and Other Frontier Ballads by Various