soundness

IPA: sˈaʊndnʌs

(uncountable) The state or quality of being sound.
(countable) The result or product of being sound.
(logic) The property (of an argument) of not only being valid, but also of having true premises.
(logic) The property of a logical theory that whenever a wff is a theorem then it must also be valid. Symbolically, letting T represent a theory within logic L, this can be represented as the property that whenever T⊢ϕ is true, then T⊨ϕ must also be true, for any wff φ of logic L.

Examples of "soundness" in Sentences

The soundness of her argument was evident in the way she presented her evidence and logic
The soundness of the building's structure was ensured by thorough inspections and quality materials
His decision to invest in the company was based on the soundness of their financial projections
The soundness of her advice was proven when her friend followed it and saw positive results
The soundness of his reasoning was validated by the success of his strategy in the long run