Played truant is a negative term, meaning someone who has deliberately avoided attending school or work without permission. So, the antonyms for played truant would be positive or neutral words that describe someone who is responsible and conscientious. Some of the antonyms could be "punctual," "reliable," "dedicated," "committed," "diligent," "attentive," "participative," or "responsible." These words imply that someone is trustworthy, accountable, and disciplined. They show a sense of moral and ethical standards that keep a person on track, ensures that they do not deviate from their duties, and are always on time to avoid absences.