cer·e·mo·ni·ous 
(sĕr′ə-mōnē-əs)
(sĕr′ə-mōnē-əs)adj.
1. Strictly observant of or devoted to ceremony, ritual, or etiquette; punctilious: "borne on silvery trays by ceremonious world-weary waiters" (Financial Times).
2.
a. Characterized by ceremony.
b. In accord with prescribed or customary usage; rigidly formal.
cer′e·moni·ous·ly adv.
cer′e·moni·ous·ness n.