RUTHLESS
Meaning of RUTHLESS in English
adjective
Synonyms: grim 3, implacable, ironfisted, merciless, mortal, relentless, unappeasable, unflinching, unrelenting, unyielding
Merriam Webster.
Collegiate thesaurus English vocabulary.
Английский энциклопедический словарь тезаурус.
2003