This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Having or exhibiting uncompromising determination; unyielding: an unrelenting human rights worker.

adj. Not diminishing in intensity, pace, or effort: an unrelenting ice storm.

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

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

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.

adj. never-ceasing

adj. not to be placated or appeased or moved by entreaty

adj. harsh

"The Democratic National Alliance Parties expressed sorrow for what they called the unrelenting response of the JMP parties to the president's call for dialogue by their inflexible conditions that lead to dialogue disruption."

continual    implacable    intense   

relent    unrelentingly    unrelentingness   

unyielding    rigid    hard    stern    cruel    relentless   

cementing    circumventing    consenting    denting    dissenting    fermenting    inventing    lamenting    misrepresenting    presenting   

relentless    remorseless    vindictive    unforgiving    inexorable    unremitting    uncompromising    fierce    fiendish    unceasing