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Treachery (Noun)

An act of deliberate betrayal.

Nouns denoting acts or actions.

The shocking discovery of the CEO's involvement in corporate espionage revealed a web of treachery that went all the way to the top.
Her husband's infidelity was a treachery she could hardly bear, shattering the trust that once held their marriage together.
The alliance was broken when one nation's treachery led to a surprise attack on their former comrades.
His own business partner's treachery left him financially and emotionally devastated, questioning the true nature of their friendship.
The historical accounts of the fallen kingdom often point to the treachery of the king's own brother as the catalyst for its downfall.

Betrayal of a trust.

Nouns denoting attributes of people and objects.

Her actions were seen by many as an act of treachery, for she had promised to keep the secret and yet she had revealed it to all.
The company's sudden bankruptcy was viewed as the result of corporate treachery by the disgruntled former employees.
He accused the members of the board of treachery, claiming that their secret deal had ruined the company.
At the campfire that evening, he learned of the treachery of his brother who had conspired against him.
The whistleblower's revelations exposed a stunning treachery by government officials, who had been embezzling funds meant for the public.