unrelenting

Having or exhibiting uncompromising determination; unyielding.

Not diminishing in intensity, pace, or effort.

That does not or will not relent; not being or becoming lenient, mild, gentle, or merciful; continuing to be hard, severe, pitiless, hostile, or cold; inexorable; unyielding.

Synonyms Relentless, Implacable, etc. (see inexorable), merciless, hard-hearted, unsparing, unpitying, rigorous, cruel.

Not relenting; unyielding; rigid; hard; stern; cruel.

Not relenting; having no pity; not being or becoming lenient, mild, gentle, or merciful; unyielding; inflexibly rigid; hard; stern; cruel.

never-ceasing

not to be placated or appeased or moved by entreaty

harsh