Etymology
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soundness (n.)

late 14c., from sound (adj.) + -ness.

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Definitions of soundness

soundness (n.)
a state or condition free from damage or decay;
soundness (n.)
the quality of being prudent and sensible;
Synonyms: wisdom / wiseness
soundness (n.)
the muscle tone of healthy tissue;
Synonyms: firmness
From wordnet.princeton.edu