"Be unfaithful" refers to breaking promises, betraying trust, or disloyalty in a relationship. There are several synonyms for the term, including cheating, straying, infidelity, adulterous, promiscuous, and having an affair. Cheating refers to deceitful and unfaithful behavior, while straying means wandering away from the commitment. Infidelity is a breach of trust and is often associated with adultery. Adulterous implies a sexual relationship with someone other than one's partner. Promiscuous means having many sexual partners, while having an affair is a secretive and intimate relationship outside of a committed partnership. Regardless of the synonym used, unfaithfulness can create severe harm in a relationship and lead to significant consequences.