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

1325–75; Middle English infirmite < Latin infirmitās. See infirm, -ity

superinfirmity, noun, plural superinfirmities.

3. flaw, defect, fault. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
infirmity (ɪnˈfɜːmɪtɪ)
n , pl -ties
1.  the state or quality of being infirm
2.  physical weakness or debility; frailty
3.  a moral flaw or failing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

infirmity in·fir·mi·ty (ĭn-fûr'mĭ-tē)

  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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
These aren't necessarily euphemisms for age and infirmity.
That's the problem: modern medicine gives us better lives now but condemns
  future generations to genetic infirmity.
Other suspected war criminals have died before the cases could proceed, or have
  not been tried because of infirmity.
Government itself is but a recognition of human infirmity.
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