ceremonious
adjective /ˌserəˈməʊniəs/
/ˌserəˈməʊniəs/
(formal)- behaving or performed in an extremely formal way
- She unveiled the picture with a ceremonious gesture.
Word Originmid 16th cent.: from French cérémonieux or late Latin caerimoniosus, from Latin caerimonia ‘religious worship’, (plural) ‘ritual observances’.