Grueling
Grueling adjective - Requiring considerable physical or mental effort.
Usage example: running a marathon is grueling
Serious
Serious adjective - Not joking or playful in mood or manner.
Grueling and serious are semantically related. Sometimes you can use "Grueling" instead an adjective "Serious".
Nearby Words: seriously, seriousness
Mutual synonyms
Cite this Source
Serious and Grueling. (2016). Retrieved 2026, July 31, from https://thesaurus.plus/related/grueling/serious
Grueling & Serious. N.p., 2016. Web. 31 Jul. 2026. <https://thesaurus.plus/related/grueling/serious>.
Serious or Grueling. 2016. Accessed July 31, 2026. https://thesaurus.plus/related/grueling/serious.
Google Ngram Viewer shows how "grueling" and "serious" have occurred on timeline