Etymology
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debility (n.)

"state or condition of being weak or feeble, lack of strength or vigor," early 15c., from Old French debilite (Modern French débilité) or directly from Latin debilitatem (nominative debilitas) "a laming, crippling, weakening," from debilis "lame, disabled, crippled," figuratively "weak, helpless," from de "from, away" (see de-) + -bilis "strength," from PIE root *bel- "strong" (see Bolshevik).

updated on July 15, 2018

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Definitions of debility from WordNet

debility (n.)
the state of being weak in health or body (especially from old age);
Synonyms: infirmity / frailty / feebleness / frailness / valetudinarianism
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.