How to say "engaged" in Japanese

• 予約済みよやくずみ
  no-adjectiveFor 'engaged' meaning reserved or booked — a seat, room, or table that someone has already reserved and that is therefore taken. A less common equivalent, it presents the booking as complete.
  掲示けいじには「全席ぜんせき予約よやく済ずみ」とあった。↗

  "Fully booked" was on the notice.
• 使用中しようちゅう
  expression, no-adjectiveFor 'engaged' meaning occupied or in use, like a toilet that is engaged. A less common equivalent, it says something is being used right now, as on a sign for an occupied toilet.

Both are less common equivalents of 'engaged': use 「予約済み」 for the 'reserved, booked' sense and 使用中 for the 'occupied, in use' sense (a toilet, for example); neither expresses 'engaged to be married'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 予約済みよやくずみreserved
• 使用中しようちゅうin use