"absenter" in the adjective sense
1. absent
not being in a specified place
2. lacking, absent, missing, wanting
nonexistent
"the thumb is absent"
"her appetite was lacking"
3. absent, absentminded, abstracted, scatty
lost in thought showing preoccupation
"an absent stare"
"an absentminded professor"
"the scatty glancing quality of a hyperactive but unfocused intelligence"
Source: WordNet® (An amazing lexical database of English)
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