unrelenting
[adjective]
Synonyms: grim, implacable, ironfisted, merciless, mortal, relentless, ruthless, unappeasable, unflinching, unyielding

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Antonyms: relenting

[TahlilGaran] English Synonym Dictionary ▲

un‧re‧lent‧ing /ˌʌnrɪˈlentɪŋ◂/ adjective formal

1. an unpleasant situation that is unrelenting continues for a long time without stopping Synonym : relentless:
the unrelenting pressures of the job

2. continuing to do something in a determined way without thinking about anyone else’s feelings Synonym : relentless:
an unrelenting opponent

[TahlilGaran] Dictionary of Contemporary English ▲