False
False adjective - Not being in agreement with what is true.
Insubstantial and false are semantically related In some cases you can use "Insubstantial" instead an adjective "False".
Insubstantial
Insubstantial adjective - Being of a material lacking in sturdiness or substance.
False and insubstantial are semantically related in weak topic. Sometimes you can use "False" instead an adjective "Insubstantial".
Cite this Source
Insubstantial and False. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/false/insubstantial
False & Insubstantial. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/false/insubstantial>.
Insubstantial or False. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/false/insubstantial.
Google Ngram Viewer shows how "false" and "insubstantial" have occurred on timeline