Rock hard
Relentless and rock hard are semantically related. In some cases you can use "Relentless" instead an adjective phrase "Rock hard".
Relentless
Relentless adjective - Showing no signs of slackening or yielding in one's purpose.
Rock hard and relentless are semantically related. Sometimes you can use "Rock hard" instead an adjective "Relentless".
Nearby Word: relentlessly
Mutual synonyms
Related pairs
- firm and rock hard
- firm and relentless
- determined and rock hard
- determined and relentless
- rigid and rock hard
- rigid and relentless
- stubborn and rock hard
- stubborn and relentless
- unyielding and rock hard
- unyielding and relentless
- immovable and rock hard
- immovable and relentless
- hard and rock hard
- hard and relentless
Cite this Source
Relentless and Rock hard. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/related/rock_hard/relentless
Rock hard & Relentless. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/related/rock_hard/relentless>.
Relentless or Rock hard. 2016. Accessed August 10, 2026. https://thesaurus.plus/related/rock_hard/relentless.
Google Ngram Viewer shows how "rock hard" and "relentless" have occurred on timeline