a.
1.
Unrelenting, relentless, implacable, pitiless, merciless, unmerciful, uncompassionate, hard, cruel.
2.
Unyielding, inflexible ( to supplication ), unbending, immovable ( by prayers ), firm, steadfast, sternly just, severe.
a.
1.
Unrelenting, relentless, implacable, pitiless, merciless, unmerciful, uncompassionate, hard, cruel.
2.
Unyielding, inflexible ( to supplication ), unbending, immovable ( by prayers ), firm, steadfast, sternly just, severe.
Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012