suffix forming adjectives from nouns and meaning "having qualities of, of the form or nature of" (manly, lordly), "appropriate to, fitting, suited to" (bodily, earthly, daily); irregularly descended from Old English -lic, from Proto-Germanic *-liko- (Old Frisian -lik, Dutch -lijk, Old High German -lih, German -lich, Old Norse -ligr), related to *likom- "appearance, form" (Old English lich "corpse, body;" see lich, which is a cognate; see also like (adj.), with which it is identical).
1746, "active, nimble, vigorous, lively," dialectal, perhaps a shortening and alteration of sprightly [Barnhart], or from a Scandinavian source (compare Old Norse sprækr, dialectal Swedish sprygg "brisk, active"), from Proto-Germanic *sprek-, perhaps from PIE root *sper- "to spread, to sow" (see sparse).
<a href="https://www.etymonline.com/word/sprightly">Etymology of sprightly by etymonline</a>
Harper, D. (n.d.). Etymology of sprightly. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/sprightly