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Definition of infirm:

  1. Not firm or sound; weak; feeble; as, an infirm body; an infirm constitution.
  2. Not solid or stable; insecure; precarious.
  3. To weaken; to enfeeble.
  4. Weak of mind or will; irresolute; vacillating.


change, bedfast, imperfect, weak, seedy, sick, feeble, lame, rachitic, precarious, ill, strong, bedrid, light, unsound, unstable, nerveless, tottering, unsteady, delicate, bedridden, weakly, flea-bitten, insecure, unaccented, shaky, woebegone, unsubstantial, frail, fallible, irresolute, insubstantial, puny, unhealthy, sick-abed, debilitated, enfeebled, decrepit, creaky, wonky, debile, washy, sapless, tottery, derelict, wobbly.

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