心不在焉

xīnzàiyān
  1. absent-minded
  2. preoccupied
  3. inattentive
  4. with one's thoughts wandering

CEDICT

absent-minded; absent-mindedly; preoccupied

Wiktionary

禮記大學》:「心不在焉視而不見聽而不聞。」心思心神集中

重編國語辭典

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