Insanity
Insanity noun - A serious mental disorder that prevents one from living a safe and normal life.
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
How words are described
Both words in one sentence
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Fairly often, however, they shift roles from "good/evil" to "reason/insanity" or "common sense/impulsiveness." Happy Harlequin Hat: Completing her harlequin inspired outfit is her iconic red and black hat, though it has two flaps and no bells.
Source: Comicbook / Harley Quinn - They didn't find him "not guilty by reason of insanity" just "not guilty" and thus he couldn't be committed without evidence that he really was mentally ill-which the prosecution had not accepted.
Source: Insanity Defense - The reason most of the Auditors go Ax-Crazy when Humanity Ensues is because they're fighting their insanity, rather than trying to work with it.
Source: Humanity Is Insane
Cite this Source
Reason and Insanity. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/insanity/reason
Insanity & Reason. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/insanity/reason>.
Reason or Insanity. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/insanity/reason.
Google Ngram Viewer shows how "insanity" and "reason" have occurred on timeline