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, ab·sent·mind·ed.
Origin:
1850–55
Related forms ab·sent-mind·ed·ly, adverb
ab·sent-mind·ed·ness, noun
Synonyms
withdrawn, musing, daydreaming, dreamy, forgetful, distracted.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.
Antonyms
attentive, alert, heedful, observant.