Lethean
Soporific
Soporific adjective - Tending to cause sleep.
Mutual synonyms
Cite this Source
Soporific and Lethean. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/lethean/soporific
Lethean & Soporific. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/lethean/soporific>.
Soporific or Lethean. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/lethean/soporific.
Google Ngram Viewer shows how "Lethean" and "soporific" have occurred on timeline