absentminded

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Definitions from WordNet

Adjective absentminded has 1 sense

absent, absentminded, abstracted, scatty - lost in thought; showing preoccupation; "an absent stare"; "an absentminded professer"; "the scatty glancing quality of a hyperactive but unfocused intelligence"
Antonym: attentive (indirect, via inattentive)

Definitions from the Web

Absentminded

Adjective

Sense 1:

Having a tendency to forget or be unaware of one's surroundings, appointments, or duties.

Example sentences:

She is often absentminded and forgets where she puts her keys.
His absentminded behavior caused him to miss his train.

Sense 2:

Characterized by a lack of attention or concentration.

Example sentences:

His absentminded gaze suggested that his mind was elsewhere.
The teacher became frustrated with the absentminded students who weren't paying attention.

Sense 3:

Showing a preoccupation of thought; daydreaming.

Example sentences:

She walked into the pole while being absentminded and lost in her thoughts.
John often gets scolded in class for his absentminded behavior of staring into space instead of paying attention.