Completely serious
Relentless and completely serious are semantically related. In some cases you can use "Relentless" instead an adjective phrase "Completely serious".
Relentless
Relentless adjective - Showing no signs of slackening or yielding in one's purpose.
Completely serious and relentless are semantically related. Sometimes you can use "Completely serious" instead an adjective "Relentless".
Nearby Word: relentlessly
Mutual synonyms
Cite this Source
Relentless and Completely serious. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/completely_serious/relentless
Completely serious & Relentless. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/completely_serious/relentless>.
Relentless or Completely serious. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/completely_serious/relentless.
Google Ngram Viewer shows how "completely serious" and "relentless" have occurred on timeline