心不在焉 (xīn bù zài yān)

absent-minded; preoccupied; inattentive; with one's thoughts wandering

Character breakdown

Usage

他上课时心不在焉,被老师批评了。

He was absent-minded in class and got scolded by the teacher.

Tā shàngkè shí xīnbùzàiyān, bèi lǎoshī pīpíng le.