ceremonious

According to the required or usual ceremonies, formalities, or rituals; specifically (Christianity, obsolete), to ceremonial laws in the Bible.

Involving much ceremony; ostentatious, showy.

Of a person: fond of ceremony or ritual, or of observing strict etiquette or formality; punctilious.

Synonym of ceremonial (“of, relating to, consisting of, or used in a ceremony or rite”); formal, ritual.