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)

  1. to invalidate.


    1. weak in health or body, esp from old age
    2. (as collective noun; preceded by the)the infirm
  1. lacking moral certainty; indecisive or irresolute
  2. not stable, sound, or securean infirm structure; an infirm claim
  3. law (of a law, custom, etc) lacking legal force; invalid

late 14c., “weak, unsound” (of things), from Latin infirmus “weak, frail, feeble” (figuratively “superstitious, pusillanimous, inconstant”), from in- “not, opposite of” (see in- (1)) + firmus (see firm (adj.)). Of persons, “not strong, unhealthy,” first recorded c.1600. As a noun from 1711.


  1. Weak in body, especially from old age or disease; feeble.
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