adjective
1.
Synonyms: rocky 1, rock-ribbed
2.
Synonyms: inflexible 2, adamant, brassbound, inexorable, obdurate, rigid, single-minded, unbending, uncompromising, unyielding
ROCKBOUND
Meaning of ROCKBOUND in English
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003