noun, plural in·fir·mi·ties for 1, 3.

  1. a physical weakness or ailment: the infirmities of age.
  2. quality or state of being infirm; lack of strength.
  3. a moral weakness or failing.

noun plural -ties

  1. the state or quality of being infirm
  2. physical weakness or debility; frailty
  3. a moral flaw or failing

late 14c., “disease, sickness; lack of capability, weakness,” from Latin infirmitatem (nominative infirmitas) “want of strength, weakness, feebleness,” noun of quality from infirmus (see infirm). Cf. Middle French infirmité, Old French enfermete.


  1. A bodily ailment or weakness, especially one brought on by old age.
  2. A condition or disease producing weakness.
  3. A failing or defect in a person’s character.

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