adj.lost in thought; showing preoccupation

"an absentminded professor"

同義詞：absentabstractedscatty

1. He is often absentminded, forgetting where he placed his glasses.
   他常常心不在焉，忘記了眼鏡放在哪里。
2. The absentminded professor arrived at the lecture without his notes.
   這位心不在焉的教授到講座時忘記帶他的講義。