Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Weak in body, especially from old age or disease; feeble. See Synonyms at weak.
  • adj. Lacking firmness of will, character, or purpose; irresolute.
  • adj. Not strong or stable; shaky: an infirm support.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Weak or ill, not in good health.
  • adj. insecure; irresolute
  • adj. frail; unstable
  • v. To contradict, to provide proof that something is not.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not firm or sound; weak; feeble
  • adj. Weak of mind or will; irresolute; vacillating.
  • adj. Not solid or stable; insecure; precarious.
  • transitive v. To weaken; to enfeeble.

from The Century Dictionary and Cyclopedia

  • Not firm, stable, or strong; lacking stability or solidity; faltering; feeble: as, an infirm support; an infirm judgment.
  • Specifically Not sound in health; impaired in health or vitality; enfeebled; weak: as, infirm in body or constitution.
  • Voidable; obnoxious to legal objection that may destroy apparent efficacy.
  • To weaken; enfeeble.
  • To make less firm or certain; render doubtful, questionable, or dubious.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. lacking bodily or muscular strength or vitality
  • adj. lacking firmness of will or character or purpose

Etymologies

Middle English infirme, from Old French, from Latin īnfirmus : in-, not; see in-1 + firmus, strong, firm; see dher- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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