Fierce
Fierce adjective - Violently unfriendly or aggressive in disposition.
Usage example: the Vikings had a well-earned reputation for being fierce warriors
Relentless is a synonym for fierce in keen topic. In some cases you can use "Relentless" instead an adjective "Fierce", when it comes to topics like violent, intense.
Nearby Words: fiercely, fierceness
Relentless
Relentless adjective - Showing no signs of slackening or yielding in one's purpose.
Fierce is a synonym for relentless in harsh topic. You can use "Fierce" instead an adjective "Relentless", if it concerns topics such as savage, merciless, cruel.
Nearby Word: relentlessly
Mutual synonyms
Cite this Source
Relentless and Fierce. (2016). Retrieved 2026, August 18, from https://thesaurus.plus/related/fierce/relentless
Fierce & Relentless. N.p., 2016. Web. 18 Aug. 2026. <https://thesaurus.plus/related/fierce/relentless>.
Relentless or Fierce. 2016. Accessed August 18, 2026. https://thesaurus.plus/related/fierce/relentless.
Google Ngram Viewer shows how "fierce" and "relentless" have occurred on timeline