absent

(verb) go away or leave. Synonyms: remove. Example: "He absented himself."

(adj) not being in a specified place. Synonyms: absent (vs. present).

(adj) nonexistent. Synonyms: lacking, missing, wanting. Examples: "The thumb is absent." "Her appetite was lacking."

(adj) lost in thought; showing preoccupation. Synonyms: absentminded, abstracted, scatty. Examples: "An absent stare." "An absentminded professor." "The scatty glancing quality of a hyperactive but unfocused intelligence."