UNRELENT'ING, adjective 1. Not relenting; having no pity; hard; cruel; as an unrelenting heart. 2. Not yielding to pity; as unrelenting cruelty. 3. Not yielding to circumstances; inflexibly rigid; as an unrelenting rule.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI