Synonyms for Rightful:

adj.

all (adjective)
true, lawful.
deserving (adjective)
righteous.
just (adjective)
legitimate.
lawful (adjective)
innocent.
proper (adjective)
legal, permitted, fair.
rightful (adjective)
legal, merited, permitted, fit, fair, fitting, right, just, due, suitable, right-minded, moral, appropriate, proper, lawful, principled, deserved, virtuous, ethical, true.
suitable (adjective)
appropriate, due.

n.

guiltless, legitimacy, innocent, current, legally, clean. proper, righteous, moral, principled, right-minded, ethical, virtuous, right. deserved, due, appropriate, merited, fit, suitable, fitting. rightful (noun)
lawful, just, true, legitimate.

Other synonyms:

current, right-minded, legally, principled, clean, legitimacy, fit, guiltless, legal, innocent. merited, virtuous, ethical. fitting. moral, proper, appropriate. righteous, right. merited
deserved.
Other relevant words:
legally, merited, permitted, fit, fair, fitting, right, innocent, due, righteous, right-minded, moral, appropriate, proper, legal, principled, deserved, virtuous, ethical, suitable.

Usage examples for rightful

  1. There is an immense lot of valuable property here, and I should think it had better be taken down into the town and kept there until claimed by its rightful owners." – A Chapter of Adventures by G. A. Henty
  2. I only guess that the- rightful prince is not worthy to tie the strings of her shoes, and yet- he is all the world to her. – Christina by L. G. Moberly
  3. Although the stone was immensely valuable, any person save the rightful owner would have an exceedingly difficult time disposing of it. – The Paternoster Ruby by Charles Edmonds Walk