Implacable and Relentless

Implacable

Implacable adjective - Sticking to an opinion, purpose, or course of action in spite of reason, arguments, or persuasion.
Usage example: an implacable judge who knew in his bones that the cover-up extended to the highest levels of government

Relentless is a synonym for implacable in merciless topic. In some cases you can use "Relentless" instead an adjective "Implacable", when it comes to topics like ruthless, uncompromising, unrelenting, inexorable. popular alternative

Nearby Words: implacability, implacably

Relentless

Relentless adjective - Showing no signs of slackening or yielding in one's purpose.
Usage example: the team's offense was relentless in trying to score a touchdown

Implacable is a synonym for relentless in merciless topic. You can use "Implacable" instead an adjective "Relentless", if it concerns topics such as inflexible, uncompromising, unrelenting, cruel. popular alternative

Nearby Word: relentlessly

Both words in one sentence

  • Film / Real Steel Charlie first came to prominence by being a no-name meat with no previous real experience in a warm-up match, giving a supposed world-class boxer quite a scare by being relentless and implacable.
  • Series / The Shannara Chronicles Implacable Man: The Reaper is silent, steady and absolutely relentless in its pursuit of the heroes, surviving crossbow bolts, sword blows, and at least one giant explosion.
  • Implacable Man: Your stalker is just as relentless in his pursuit of you as Nemesis is.
Cite this Source
Relentless and Implacable. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/implacable/relentless
Implacable & Relentless. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/implacable/relentless>.
Relentless or Implacable. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/implacable/relentless.
Google Ngram Viewer shows how "implacable" and "relentless" have occurred on timeline