adjective
1.
Synonyms: inflexible 2, adamant, brassbound, inexorable, obdurate, relentless, rigid, single-minded, steadfast, unbending
2.
Synonyms: persistent 1, insistent, perseverant, perseverative, persevering, persisting, persistive
adjective
1.
Synonyms: inflexible 2, adamant, brassbound, inexorable, obdurate, relentless, rigid, single-minded, steadfast, unbending
2.
Synonyms: persistent 1, insistent, perseverant, perseverative, persevering, persisting, persistive
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003