Resilient

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mid 17th century: from Latin resilient- ‘leaping back’, from the verb resilire (see resile).

wiktionary

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From Middle English resilient, from Old French resilient, from Latin resiliēns, present active participle of resiliō(“I leap or spring back”).

etymonline

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resilient (adj.)

1640s, "springing back, returning to the original position," from Latin resilientem "inclined to leap or spring back," present participle of resilire "to jump back" (see resilience). Of material things, "resuming original shape after compression, etc.," by 1670s. Figuratively, of persons "bouncing back" from difficulties, etc., from 1830. Related: Resiliently.