Fixed idea
Lunacy and fixed idea are semantically related. in fixation topic. In some cases you can use "Lunacy" instead a noun phrase "Fixed idea".
Lunacy
Lunacy noun - A foolish act or idea.
Mutual synonyms
Related pairs
Cite this Source
Lunacy and Fixed idea. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/fixed_idea/lunacy
Fixed idea & Lunacy. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/fixed_idea/lunacy>.
Lunacy or Fixed idea. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/fixed_idea/lunacy.
Google Ngram Viewer shows how "fixed idea" and "lunacy" have occurred on timeline