The plural of infirmity is infirmities. For most words ending in y, change it to i and add es.
The plural form of the noun 'infirmity' is infirmities.
His infirmity made it impossible for him to play football.
With old age infirmity can be a problem.
This infirmity will soon be mitigated, under my watchful attendance.
There is no such thing as 'normal bodily infirmity' in either women or men
The word infirmity means bodily weakness, often ascribed to illness or advanced age.
of Infirmity
The healing of the man with an infirmity occurred at the pool in Bethesda.
The cast of From Infirmity to Firmness - 2007 includes: Robin Simmonds
to be in want of strength
weakness or diasbility
to be in want of strength