adjective
ceremonious
sair-uh-MOH-nee-us/ˌserəˈməʊniəs/
Marked by formal ritual or elaborate politeness.
The official makes a ceremonious presentation of the key to the older woman.

Etymology
The sacred-rite sense of caerimonia broadened to include social formalities and polite customs. Ceremonious characterizes someone who carefully observes those outward forms, not merely something connected with a ceremony.
In context
he took Her Grace’s hand, and bent over it with that ceremonious politeness which was one of the man’s chief characteristics.
More examples
- They exchange ceremonious expressions of thanks.
- The delegation receives a ceremonious welcome.
- She prefers a simple meal to a ceremonious banquet.
Similar words
- formal
- Follows established conventions without necessarily elaborate ritual.
- courtly
- Suggests polished manners associated with a royal court.