Erstwhile
Erstwhile adjective - Having been such at some previous time.
Pioneering and erstwhile are semantically related. In some cases you can use "Pioneering" instead an adjective "Erstwhile".
Pioneering
Erstwhile and pioneering are semantically related. Sometimes you can use "Erstwhile" instead an adjective "Pioneering".
Cite this Source
Pioneering and Erstwhile. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/erstwhile/pioneering
Erstwhile & Pioneering. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/erstwhile/pioneering>.
Pioneering or Erstwhile. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/erstwhile/pioneering.
Google Ngram Viewer shows how "erstwhile" and "pioneering" have occurred on timeline