Ancient
Ancient adjective - Dating or surviving from the distant past.
Relentless and ancient are semantically related. In some cases you can use "Relentless" instead an adjective "Ancient".
Nearby Word: anciently
Relentless
Relentless adjective - Showing no signs of slackening or yielding in one's purpose.
Ancient and relentless are semantically related. Sometimes you can use "Ancient" instead an adjective "Relentless".
Nearby Word: relentlessly
Both words in one sentence
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Both show the ruined remains of the modern cities succumbing to nature's relentless advances, but showcases also several ancient ruins surviving for even more time.
Source: Ruins of the Modern Age -
Thanks to the diplomacy and action of Commander Shawn Shepard , every species threw aside their differences and banded together to fight the ancient menace, but the onslaught was relentless and defeat was almost certain.
Source: Fanfic / Shepard's R&R
Cite this Source
Relentless and Ancient. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/ancient/relentless
Ancient & Relentless. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/ancient/relentless>.
Relentless or Ancient. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/ancient/relentless.
Google Ngram Viewer shows how "ancient" and "relentless" have occurred on timeline