Translation

形式ばった / 仰々しい / 礼儀正しすぎる

Meaning

Ceremonious describes behavior that is very formal, carefully polite, and often rather grand or stiff. It is about manner, while ceremonial is about connection to an actual ceremony or ritual.

Examples

• 彼は深く、形式ばったお辞儀をしました。
  He made a deep, ceremonious bow.
• 支配人は仰々しい挨拶で客を迎えました。
  The manager greeted the guests in a ceremonious manner.