simple past tense and past participle of abstract
lost in thought; showing preoccupation
"an absent stare"
"an absentminded professor"
"the scatty glancing quality of a hyperactive but unfocused intelligence"
Separated or disconnected; withdrawn; removed; apart.
The word comes from the verb "abstract" with the suffix "-ed" added to indicate a past action or state. It originally meant something that was taken away or separated from its original context.