Rightful
来自Big Physics
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Old English rihtful ‘upright, righteous’ (see right, -ful). The notion of ‘legitimacy’ dates from Middle English.
wiktionary
From Middle English rightful, ryghtfull, riȝtful, from Old English *rihtfull (suggested by derivative unrihtfull(“unrightful”)), equivalent to right + -ful.
etymonline
rightful (adj.)
Old English rihtful "disposed to do right;" see right (adj.1) + -ful. By late 13c. of actions, "in conformity to what is just or right." The sense of "legal, lawful, legitimate" is from early 14c. Related: Rightfully; rightfulness.
