intransigent
in·tran·si·gent
inˈtransəjənt,inˈtranzəjənt/
adjective
adjective: intransigent
  1. unwilling or refusing to change one’s views or to agree about something.
    synonyms: uncompromising, inflexible, unbending, unyielding, diehard, unshakable, unwavering,resolute, rigid, unaccommodating, uncooperative, stubborn, obstinate, obdurate,pigheaded, single-minded, iron-willed, stiff-necked

    “the regime remained intransigent in its opposition to wider participation in the political process”
    antonyms: compliant
noun
noun: intransigent; plural noun: intransigents
  1. an intransigent person.
Origin
late 19th century: from French intransigeant, from Spanish los intransigentes (a name adopted by the extreme republicans in the Cortes, 1873–74); based on Latin in- ‘not’ + transigere ‘come to an understanding.’