noun
a state of being forgetful or inattentive
adjective
absentminded
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Her absentmindedness often caused her to forget important meetings.
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I can't believe I left my keys at home again, my absentmindedness is getting out of hand.
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His absentmindedness is next level, he's always losing his phone.
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The absentmindedness of the professor led to a confusing lecture for the students.