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.


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withdrawn, musing, daydreaming, dreamy, forgetful, distracted.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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To absentmindedly
World English Dictionary
preoccupied; forgetful; inattentive

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Then in meetings, you absentmindedly button and unbutton them.
While at the counter making your payment, absentmindedly you hand over your cell phone number.
When he absentmindedly set his kitchen on fire one day, the fright is too much.
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