Infirm

(18), a. [Prefix in, not, and firm; Fr. in-firme, Lat. infirmus, It. infermo, Sp. & Pg. enfermo, Pr. enferm.]

1. Not firm or sound; weak; feeble; as, an infirm body; an infirm constitution. “A poor, infirm, weak, and despised old man.” Shak.
2. Weak of mind; irresolute. “Infirm of purpose.” Shak.
3. Not solid or stable.

He who fixes on false principles treads on infirm ground. South. Syn.—Debilitated; sickly; feeble; enfeebled; irresolute; imbecile.