- truant, awol - absent without permission; "truant schoolboys"; "the soldier was AWOL for almost a week"
Antonym: present (indirect, via absent)
- truant, hooky player - one who is absent from school without permission
--1 is a kind of absentee
- no-show, nonattender, truant - someone who shirks duty
--2 is a kind of wrongdoer, offender