die-hard/diehard

old-line ultraconservative unreconstructed

conservative dyed-in-the-wool immovable intransigent

convinced extremist firm inflexible orthodox reactionary standpat standpatter stubborn traditionalistic

compromising conceding flexible

fanatic fundamentalist zealot

extremist pullback reactionary right-winger rightist stick-in-the-mud ultraconservative

bitter-ender intransigent mossback old liner standpat standpatter true-blue