infirm

Infirm is a related term of infirmarer.

As an adjective infirm

is weak or ill, not in good health.

As a verb infirm

is to contradict, to provide proof that something is not.

As a noun infirmarer is

(archaic|historical) one who took care of the sick, especially in a medieval monastery or nunnery; physician.

As adjectives the difference between infirm and valetudinary

is that infirm is weak or ill, not in good health while valetudinary is (obsolete) sickly, infirm, valetudinarian.

As a verb infirm

is to contradict, to provide proof that something is not.