Rightful1. (a.) Having the right or just claim; as, the rightful owner; being or holding by right; as, the rightful heir to a throne or an estate; a rightful king.
2. (a.) Righteous; upright; just; good; -- said of persons.
3. (a.) Consonant to justice; just; as, a rightful cause.
4. (a.) Belonging, held, or possessed by right, or by just claim; as, a rightful inheritance; rightful authority.
Thesaurus Entries
according to Hoyle, actionable, applicable, appropriate, apt, authentic, authorized, balanced, becoming, befitting, bona fide, candid, card-carrying, competent, condign, constitutional, correct, de jure, decent, decorous, defensible, deserved, dinkum, due, equitable, even, evenhanded, fair, fair and square, fit, fitting, following the letter, genuine, good, honest, honest-to-God, impartial, inartificial, judicial, juridical, just, justiciable, justifiable, justified, kosher, lawful, lawmaking, legal, legislative, legit, legitimate, level, licit, lifelike, literal, meet, meet and right, merited, natural, naturalistic, nice, normal, normative, original, proper, pure, real, realistic, requisite, right, right and proper, righteous, sanctioned, seemly, simon-pure, simple, sincere, square, statutory, sterling, suitable, sure-enough, TRUE, true to life, true to nature, true to reality, unadulterated, unaffected, unassumed, unassuming, uncolored, unconcocted, uncopied, uncounterfeited, undisguised, undisguising, undistorted, unexaggerated, unfabricated, unfanciful, unfeigned, unfeigning, unfictitious, unflattering, unimagined, unimitated, uninvented, unpretended, unpretending, unqualified, unromantic, unsimulated, unspecious, unsynthetic, unvarnished, valid, verbal, verbatim, veridical, verisimilar, warrantable, warranted, within the law, word-for-word