'Soundness' definitions:

Definition of 'soundness'

From: WordNet
noun
A state or condition free from damage or decay [ant: unsoundness]
noun
The quality of being prudent and sensible [syn: wisdom, wiseness, soundness] [ant: unsoundness]
noun
The muscle tone of healthy tissue; "his muscular firmness" [syn: firmness, soundness] [ant: unsoundness]

Definition of 'Soundness'

From: GCIDE
  • Soundness \Sound"ness\, n. The quality or state of being sound; as, the soundness of timber, of fruit, of the teeth, etc.; the soundness of reasoning or argument; soundness of faith. [1913 Webster]
  • Syn: Firmness; strength; solidity; healthiness; truth; rectitude. [1913 Webster]

Synonyms of 'soundness'

From: Moby Thesaurus