adj consonant to justice; just; as, a rightful cause.
2. rightful ·adj righteous; upright; just; good;
said of persons.
3. rightful ·adj belonging, held, or possessed by right, or by just claim; as, a rightful inheritance; rightful authority.
4. rightful ·adj having the right or just claim according to established laws; being or holding by right; as, the rightful heir to a throne or an estate; a rightful king.