Relentless
Relentless adjective - Showing no signs of slackening or yielding in one's purpose.
Rigorous is a synonym for relentless in cruel topic. In some cases you can use "Rigorous" instead an adjective "Relentless".
Nearby Word: relentlessly
Rigorous
Rigorous adjective - Given to exacting standards of discipline and self-restraint.
Usage example: a rigorous football coach who pushes his players to their physical and mental limits
Relentless is a synonym for rigorous in strict topic. Sometimes you can use "Relentless" instead an adjective "Rigorous".
Mutual synonyms
Related pairs
Cite this Source
Rigorous and Relentless. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/relentless/rigorous
Relentless & Rigorous. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/relentless/rigorous>.
Rigorous or Relentless. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/relentless/rigorous.
Google Ngram Viewer shows how "relentless" and "rigorous" have occurred on timeline