Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Relentless and difficult are semantically related. In some cases you can use "Relentless" instead an adjective "Difficult".
Nearby Word: difficulty
Relentless
Relentless adjective - Showing no signs of slackening or yielding in one's purpose.
Difficult and relentless are semantically related. Sometimes you can use "Difficult" instead an adjective "Relentless".
Nearby Word: relentlessly
Both words in one sentence
-
Proving Leo innocent is made difficult by the relentless work of prosecutor Hugh Dorsey, determined to convict Leo on flimsy evidence with the testimony of Jim Conley.
Source: Theatre / Parade - Hellsinker is relentless, confusing, and even the first two bosses on the Behind (default) path are pretty difficult.
Source: Nintendo Hard / Shoot'em Ups -
It is much more difficult, as not only are the Main 4 cheap beyond all belief, but Nightmare is much more relentless than Fredbear.
Source: Boss Rush
Cite this Source
Relentless and Difficult. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/difficult/relentless
Difficult & Relentless. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/difficult/relentless>.
Relentless or Difficult. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/difficult/relentless.
Google Ngram Viewer shows how "difficult" and "relentless" have occurred on timeline