Oath-breaking is a term used to describe the act of failing to keep one's promise or commitment. It is a serious offense that often results in the loss of trust and respect from others. There are various synonyms that can be used to describe oath-breaking such as treachery, disloyalty, perfidy, betrayal, infidelity, and faithlessness. Each of these words emphasizes the seriousness of the offense and the impact it has on relationships and reputation. It is important to uphold one's promises and commitments as it is essential in building strong and lasting relationships with others, whether in personal or professional settings.