A breach of friendship can be described using various synonyms that convey the same meaning. Betrayal, disloyalty, treachery, and perfidy are some of the synonyms for a breach of friendship. These words describe the act of breaking the trust and loyalty between two friends, which can lead to a permanent breakdown of the relationship. Other words that can be used to describe a breach of friendship include backstabbing, faithlessness, infidelity, deceit, and duplicity. These words all describe a violation of trust between two individuals who had established a close bond, and each of them carries a negative connotation that reflects the severity of the offense.