preoccupied

Definition

Absorbed in thought, especially about a specific concern, to the extent of being unaware of one's surroundings.

한국어 특정 문제에 대해 생각에 잠겨, 자신의 환경에 대한 인식이 없는 상태

Example

"He seemed preoccupied during dinner, staring blankly at his plate."