adjective
1.
Synonyms: stiff 1, immalleable, impliable, incompliant, inelastic, inflexible, rigid, unbending, unflexible
Antonyms: yielding
2.
Synonyms: obstinate , bullheaded, headstrong, intractable, mulish, pertinacious, pigheaded, refractory, self-willed, stubborn
Related Word: firm, fixed, rigid
Antonyms: yielding
3.
Synonyms: grim 3, implacable, ironfisted, merciless, mortal, relentless, ruthless, unappeasable, unflinching, unrelenting
4.
Synonyms: tough 3, hard-line, inflexible, uncompromising
Antonyms: yielding
5.
Synonyms: inflexible 2, inexorable, obdurate, relentless, rigid, single-minded, unbending, uncompliant, uncompromising, unswayable