Diehard [noun]

● Zealot

● Fanatic

● Pullback

● Right

● Reactionary

● Praetorian

● Ultraconservative

● Fogy

● Extremist

● Stick-in-the-mud

● Rightist

● Right-winger

● Mossback

● Dyed-in-the-wool

● Intransigent

● Fundamentalist

● Tory

● Bourbon

● Bitter ender

● Old liner

● Standpat

● Standpatter

● True blue

● Diehard

● Traditionalist

● Fanatic

● Fanatical

● Steadfast

● Stubborn

● Tenacious

● Obstinate

● Entrenched

● Recalcitrant

● Stubbornness

● Intransigent

● Intransigence

● Persistent

● Extremist

● Intractable

● Persistence

● Hard-line

● Ultranationalist

● Ardent

● Rabid

● Fervent

● Staunch

● Avid

● Loyal

● Devout

● Hardcore

● Faithful

● Inveterate

● Stalwart

● Passionate

● Unabashed

● Longtime

● Zealous

● Vociferous

● Loyalist

● Anglophile

● Obsessive

● Fervid

● Enthusiastic

● Vehement

● Avowed

● Die hard

● Lifelong

● Keenest

● Beloved

● Heartiest

● Disgruntled

● Crankiest

● Hardiest

● Jaded

● Loving

● Unreconstructed

● Rouser

● Unregenerate

● Crazed

● Ite

● Crustiest

● Surliest

● Bloodthirsty

● Undying

● Cheering

● Pickiest

● Flabelliform

● Crabby

● Undiscerning

● Hard core

● Ornery

● Weariest

● Fickle

● Francophile

● Besotted

● Fond

● Minded

● Plucky

● Enraptured

● Embittered

● Superstitious

● Mad

● Delirious

● Vincible

● Dyed

● Fussiest

● Flabellate

● Intrepid

● Wiliest

● Incorrigible

● Gippy

● Hardbitten

● Buff

● Embraceable

● Neanderthal

● Allegiant

● Masochistic

● Envious

● Charmed

● Gruntled

● Fondest

● Onetime

● Quintessential