adjective

Showing a lack of concentration on what is happening around one.

she seemed abstracted and unaware of her surroundings

absent-minded,distracted,preoccupied,absorbed,engrossed,far away,somewhere else,not there,not with us,in a world of one’s own,with one’s head in the clouds,daydreaming,dreamy,inattentive,thoughtful,pensive,lost in thought,deep in thought,immersed in thought,wool-gathering,in a brown study,musing,brooding,absent,distrait,heedless,oblivious