Reason
Reason noun - The normal or healthy condition of the mental abilities.
Usage example: was afraid that with all the stress he was under, he'd lose all reason
Soundness is a synonym for reason in sense topic. In some cases you can use "Soundness" instead a noun "Reason", when it comes to topics like sane, mental analysis.
Mutual synonyms
Related pairs
Cite this Source
Soundness and Reason. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/reason/soundness
Reason & Soundness. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/reason/soundness>.
Soundness or Reason. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/reason/soundness.
Google Ngram Viewer shows how "reason" and "soundness" have occurred on timeline