Another word for absent
away, missing, elsewhere, gone, gone out, vanished, moved, removed, flown, not at home, not present, out, wanting, lacking, nonexistent, nonattendant, abroad, lost, overseas, out of sight, nowhere to be found, on leave, astray, on vacation, in absentia (Latin), on tour, engaged elsewhere, taken, omitted, truant, on French leave*, AWOL*, playing hooky*, split*.
Another word for absentadjective
Not present:away, gone, missing, wanting. See absence
Deficient in a usual or needed amount:lacking, wanting. See excess
So lost in thought as to be unaware of one's surroundings:absent-minded, abstracted, bemused, distrait, faraway, inattentive, preoccupied. Idiom: a million miles away. See ability, awareness