noun

absentmindedness

forgetfulness, inattentiveness, preoccupation

His absentmindedness is becoming a problem.

His absentmindedness is becoming a problem.

In a moment of absentmindedness, I left my keys.

In a moment of absentmindedness, I left my keys.

a moment of absentmindedness a brief period of being distracted In a moment of absentmindedness, I left my keys.

Synonyms: inattention, distraction; Antonyms: attentiveness, mindfulness

From 'absent' + 'minded' + '-ness' (a suffix forming nouns of state). The state of having one's mind be absent.

Break it down: the '-ness' (state) of being 'absent-minded' (your mind is absent).

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