Infirm

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.]