treachery, infidelity, breach of trust, double-dealing, falsity, perfidy (literary), unfaithfulness, falseness, betrayal of trust, Collins Dictionary TRAITOROUS Definition & Meaning - Merriam-Webster
Engaging in acts that oppose a nation, leader, or cause, including aiding an enemy or committing rebellion. traitorousness
Traitorousness - Definition, Meaning & Synonyms | Vocabulary.com breach of trust
Acting in a way that violates a personal or professional promise, such as breaking a vow or revealing a secret. betrayal of trust