The plural form of the noun 'infirmity' is infirmities.
The plural of infirmity is infirmities. For most words ending in y, change it to i and add es.
With old age infirmity can be a problem.
The word infirmity means bodily weakness, often ascribed to illness or advanced age.
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His infirmity made it impossible for him to play football.
The word crises is a plural word; it is the plural form of the word crisis.
This infirmity will soon be mitigated, under my watchful attendance.
The word is "bedridden".
There is no plural word for if.
The plural form for the demonstrative pronoun this is these.
A non-plural word, a word (noun or pronoun) that is not plural is singular, a word for just one.
The plural word of delay is delays.