in·firm

[in-furm]
adjective
1.
feeble or weak in body or health, especially because of age; ailing.
2.
unsteadfast, faltering, or irresolute, as persons or the mind; vacillating: infirm of purpose.
3.
not firm, solid, or strong: an infirm support.
4.
unsound or invalid, as an argument or a property title.
verb (used with object)
5.
to invalidate.
00:10
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to run away hurriedly; flee.

Origin:
1325–75; Middle English infirme < Latin infirmus. See in-3, firm1

in·firm·ly, adverb
in·firm·ness, noun


1, 3, 4. weak. 2. wavering, indecisive. 3. rickety, tottering, shaky, unsteady.


1, 2, 3. strong.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
infirm (ɪnˈfɜːm) [Click for IPA pronunciation guide]
 
adj
1.  a.  weak in health or body, esp from old age
 b.  (as collective noun; preceded by the): the infirm
2.  lacking moral certainty; indecisive or irresolute
3.  not stable, sound, or secure: an infirm structure; an infirm claim
4.  law (of a law, custom, etc) lacking legal force; invalid
 
in'firmly
 
adv
 
in'firmness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

infirm
late 14c., "weak, unsound" (of things), from L. infirmus "weak, frail," from in- "not" + firmus (see firm (adj.)). Of persons, "not strong, unhealthy," first recorded 1605.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

infirm in·firm (ĭn-fûrm')
adj.
Weak in body, especially from old age or disease; feeble.

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
The way that humans take care of the sick and infirm within their communities
  is considered a unique trait.
Infirm buildings collapse each week, sometimes because they cannot withstand
  the vibrations from nearby construction work.
Space was valuable on the wagon train and, if available, for the old and infirm
  only.
Four of their highest-ranking leaders await trial but they are old and infirm.
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