noun (common) (futsuumeishi) only applies to 硬骨 bone

noun (common) (futsuumeishi)nouns which may take the genitive case particle 'no'adjectival nouns or quasi-adjectives (keiyodoshi) firmness (of character);backbone;unyielding spirit

noun (common) (futsuumeishi) man of principle;man of firm character;man of steadfast beliefs