absentminded

/ˌæbsəntˈmaɪndɪd/
adjective
  1. Tending to forget things or not pay attention because you are thinking about other things.
    • He gave an absentminded nod while reading his book.
    • She was so absentminded that she put salt in her coffee instead of sugar.
    • My absentminded professor often forgets where he left his glasses.
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