Unsubstantiated
Unsubstantiated adjective - Having no basis in reason or fact.
Vain and unsubstantiated are semantically related. In some cases you can use "Vain" instead an adjective "Unsubstantiated".
Nearby Word: unsubstantially
Vain
Vain adjective - Having too high an opinion of oneself.
Unsubstantiated and vain are semantically related. Sometimes you can use "Unsubstantiated" instead an adjective "Vain".
Cite this Source
Vain and Unsubstantiated. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/unsubstantiated/vain
Unsubstantiated & Vain. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/unsubstantiated/vain>.
Vain or Unsubstantiated. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/unsubstantiated/vain.
Google Ngram Viewer shows how "unsubstantiated" and "vain" have occurred on timeline