Fixed idea
Illusion and fixed idea are semantically related. In some cases you can use "Illusion" instead a noun phrase "Fixed idea".
Illusion
Illusion noun - A conception or image created by the imagination and having no objective reality.
Fixed idea and illusion are semantically related. Sometimes you can use "Fixed idea" instead a noun "Illusion".
Mutual synonyms
Cite this Source
Illusion and Fixed idea. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/fixed_idea/illusion
Fixed idea & Illusion. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/fixed_idea/illusion>.
Illusion or Fixed idea. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/fixed_idea/illusion.
Google Ngram Viewer shows how "fixed idea" and "illusion" have occurred on timeline