Synonyms of irrefragable

2 Syllables
undying, deathless, odds-on
3 Syllables
enduring, durable, perpetual, immortal, unfading, abiding, permanent
4 Syllables
unbreakable, immutable, unarguable, unchangeable, conclusive, indelible, undestroyable, everlasting
5 Syllables
irrebuttable, unalterable, unanswerable, irrefrangible, indubitable, indissoluble, irrefutable, inextirpable, nonperishable, incorruptible, imperishable, indestructible
6 Syllables
inexterminable, inextinguishable