unbending[adjective]Synonyms: inflexible, firm, intractable, resolute, rigid, severe, strict, stubborn, tough, uncompromising 
Antonyms: bendable
 [TahlilGaran] English Synonym Dictionary ▲
 un‧bend‧ing /ʌnˈbendɪŋ/ 
 adjective unwilling to change your opinions, decisions etc
 Antonym : flexible  [TahlilGaran] Dictionary of Contemporary English ▲