UNSOUND'NESS, noun 1. Defectiveness; as the unsoundness of timber. 2. Defectiveness of faith; want of orthodoxy. 3. Corruptness; want of solidity; as the unsoundness of principles. 4. Defectiveness; as the unsoundness of fruit. 5. Infirmity; weakness; as of body; as the unsoundness of the body or constitution.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI