Unfounded
Unfounded adjective - Having no basis in reason or fact.
Vain and unfounded are semantically related. in speculative topic. In some cases you can use "Vain" instead an adjective "Unfounded", when it comes to topics like not based on fact.
Nearby Word: unfoundedly
Cite this Source
Vain and Unfounded. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/unfounded/vain
Unfounded & Vain. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/unfounded/vain>.
Vain or Unfounded. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/unfounded/vain.
Google Ngram Viewer shows how "unfounded" and "vain" have occurred on timeline