Observant of decencies is a phrase used to describe someone who is keen on upholding proper decorum and social norms. Synonyms for this phrase could include words such as courteous, respectful, polite, well-behaved, civilized, considerate, tactful, and conscientious. All of these terms denote an individual who is attentive to the needs and expectations of others, and strives to maintain a level of decorum that is appropriate for the given social setting. Whether in formal or informal contexts, being observant of decencies is an important trait that can help foster positive relationships, build trust, and enhance one's overall reputation in the community.