Relentless
Relentless adjective - Showing no signs of slackening or yielding in one's purpose.
Severe is a synonym for relentless in behaviour topic. In some cases you can use "Severe" instead an adjective "Relentless", when it comes to topics like harsh.
Nearby Word: relentlessly
Severe
Severe adjective - Given to exacting standards of discipline and self-restraint.
Usage example: a severe, uncompromising teacher who locked the classroom door precisely when the bell rang and let no one in afterward
Relentless is a synonym for severe in strict topic. Sometimes you can use "Relentless" instead an adjective "Severe", if it concerns topics such as behaviour, uncompromising.
Mutual synonyms
Related pairs
Both words in one sentence
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Then you see the relentless predation that Greenscale, the Life Dragon, champions... There's also the problem of the Guardians' severe loyalty to the gods, and how they perform said loyalty.
Source: Video Game / Rift -
One character had severe untreated social anxiety, another was relentless bullied in school, and a third has a Dark and Troubled Past.
Source: Hikikomori
Cite this Source
Severe and Relentless. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/relentless/severe
Relentless & Severe. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/relentless/severe>.
Severe or Relentless. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/relentless/severe.
Google Ngram Viewer shows how "relentless" and "severe" have occurred on timeline