intransigent

impervious to pleas, persuasion, requests, reason; "he is adamant in his refusal to change his mind"; "Cynthia was inexorable; she would have none of him"- W.Churchill; "an intransigent conservative opposed to every liberal tendency"

बराक ओबामा के राष्ट्रपति पद के अभियान के दौरान, सेनेटर टेड केरी उनके कट्टर समर्थक थे।

We are unable to reach any compromise due to their intransigent nature.