Dictionary.net

the firmness and tone of healthy tissue; "his muscle firmness"

the firmness and tone of healthy tissue; "his muscle firmness"

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.

n. State of being sound or firm; strength; solidity;-wholeness ; entireness ; undecayed or unimpaired state; health ; heartiness ;- truth; rectitude ;-validity; cogency;-orthodoxy.