The Collaborative International Dictionary of English v.0.48:
Infirmity \In*firm"i*ty\, n.; pl. Infirmities. [L. infirmitas
: cf. F. infirmite. See Infirm, a.]
1. The state of being infirm; feebleness; an imperfection or
weakness; esp., an unsound, unhealthy, or debilitated
state; a disease; a malady; as, infirmity of body or mind.
'T is the infirmity of his age. --Shak.
2. A personal frailty or failing; foible; eccentricity; a
weakness or defect.
Will you be cured of your infirmity ? --Shak.
A friend should bear his friend's infirmities.
The house has also its infirmities. --Evelyn.
Syn: Debility; imbecility; weakness; feebleness; failing;
foible; defect; disease; malady. See Debility.