RIGHTFUL, adjective 1. Having the right or just claim according to established laws; as the rightful heir to a throne or an estate. 2. Being by right, or by just claim; as a rightful lord; rightful property; rightful judge. 3. Just; consonant to justice; as a rightful cause; a rightful war.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI