Perfidity

The perfidity of the politician's promises was revealed after the election.

The employee was fired for perfidity towards the company's confidential information.

The betrayal of her best friend left her feeling hurt and betrayed by her perfidity.

His perfidity towards his wife was the cause of their divorce.

The company was shocked by the perfidity of their trusted accountant who had been embezzling money.

The perfidity of the witness was exposed during cross-examination in the courtroom.