truant

truant \TROO-uhnt\, noun:

1. a person who shirks or neglects his or her duty.
2. a student who stays away from school without permission.

adjective:
1. absent from school without permission.
2. neglectful of duty or responsibility; idle.
3. of, pertaining to, or characteristic of a truant.

verb:
1. to be truant.

Ozcma hath no hold on my heart, in the way thou fanciest — never had, beyond a passing and truantinclination.

-- James Fenimore Cooper, Mercedes of Castile, 1861

He thought of his coming trip to Spain, and then, catching sight of her looking out towards the town and ocean, bit the truant thought back.

-- Pico Iyer, Abandon, 2007

Truant comes to English from the Old French word of the same spelling meaning "beggar" or "rogue." The noun form of truant entered English in the late 1200s, though it was not until the 1500s that English speakers started using this term as an adjective.