absent-minded

[ab-suhnt-mahyn-did]
adjective
so lost in thought that one does not realize what one is doing, what is happening, etc.; preoccupied to the extent of being unaware of one's immediate surroundings.
Also, absentminded.


Origin:
1850–55

absent-mindedly, adverb
absent-mindedness, noun


withdrawn, musing, daydreaming, dreamy, forgetful, distracted. Absent-minded, abstracted, oblivious all mean inattentive to immediate surroundings. Absent-minded suggests an unintentional wandering of the mind from the present: an absent-minded committee member. Abstracted implies that the mind has been drawn away from the immediate present by reflection upon some engrossing subject: an abstracted air. Oblivious implies absorption in some thought that causes one to be completely forgetful of or unaware of one's surroundings: oblivious of danger.


attentive, alert, heedful, observant.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
absent-minded
 
adj
preoccupied; forgetful; inattentive
 
absent-'mindedly
 
adv
 
absent-'mindedness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

absentminded
also absent-minded, "preoccupied," 1854, from absent + mind (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The halls of academe have long been a forgiving environment for absentminded
  professors.
He was exactly the way he is now- shabby, shambling, absentminded.
She seemed smooth-faced, with a certain absentminded perfection.
Daydreaming may seem absentminded and pointless, but it actually demands a lot
  of the brain's processing power.
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