INFIRM, adjective inferm'. [Latin infirmus; in and firmus.] 1. Not firm or sound; weak; feeble; as an infirm body; an infirm constitution. 2. Weak of mind; irresolute; as infirm of purpose. 3. Not solid or stable. He who fixes on false principles, treads on infirm ground. INFIRM, verb transitive inferm'. To weaken. [Not used.]
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI