adjective Date: 1588 not softening or yielding in determination ; hard , stern , not letting up or weakening in vigor or pace ; constant , ~ly adverb
UNRELENTING
Meaning of UNRELENTING in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012