Merciless
Merciless adjective - Having or showing a lack of sympathy or tender feelings.
Persistent and merciless are semantically related in relentless topic. In some cases you can use "Persistent" instead an adjective "Merciless".
Persistent
Persistent adjective - Continuing despite difficulties, opposition, or discouragement.
Merciless and persistent are semantically related in relentless topic. Sometimes you can use "Merciless" instead an adjective "Persistent".
Mutual synonyms
Both words in one sentence
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Reality Ensues: They really are that armored, that accurate, that persistent and that totally merciless. Consistently.
Source: Franchise / Terminator
Cite this Source
Persistent and Merciless. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/merciless/persistent
Merciless & Persistent. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/merciless/persistent>.
Persistent or Merciless. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/merciless/persistent.
Google Ngram Viewer shows how "merciless" and "persistent" have occurred on timeline