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in‧firm

1 weak or ill for a long time, especially because you are old :
Her grandmother is elderly and infirm.
Her grandmother is elderly and infirm.2 people who are weak or ill for a long time, especially because they are old :
The hotel is on a hill, which is not ideal for the infirm.
the infirm
The hotel is on a hill, which is not ideal for the infirm.