casual Absence without leave; truancy: play hooky from college.
lack from school or work.
A word used only in expression to relax and play hooky, is truant, to hightail it; -- used mainly of young ones absent from school without a legitimate explanation and without knowledge of their moms and dads. In addition (figuratively and jocosely), to-be absent from task for frivolous reasons.
A pupil missing from college without leave; a truant: only inside expression to try out hooky, equal to to try out truant. Additionally hookey.