Synonym of unbending

inflexible fixed rigid adamant obdurate dogmatic doctrinaire formal pitiless tough crisp firm obstinate reserved aloof distant do or die dug in hard as nails hard-line hold one's ground hold the fort hold the line incompliant inelastic inexorable intractable locked in relentless resolute set in stone severe single-minded standing one's ground standing pat sticking to one's guns stiff strict stubborn uncompromising unflexible unrelenting unswayable unyielding uptight