simple past tense and past participle of infirm

Weak or ill, not in good health. / Irresolute; weak of mind or will. / Frail; unstable; insecure.

To contradict, to provide proof that something is not.

feebleness, frailty or ailment, especially due to old age. / a moral weakness or defect

plural of infirmity

(philosophy) disconfirmation

comparative form of infirm: more infirm

Third-person singular simple present indicative form of infirm

present participle of infirm

(obsolete) Tending to weaken, annul, or make void.