Durable, Enduring, Fated, Fateful, Firm, Fixed, Flinty, Fractious, Frozen, Fundamentalist, Grim, Hard, Harsh, Headstrong, Heartless, Heavy, Hidebound, Immobile, Immovable, Immutable, Impenetrable, Impervious, Implacable, Impregnable, Inclement, Incontestable, Indefeasible, Indomitable, Inelastic, Ineluctable, Inescapable, Inevitable, Inexorable, Inextensible, Inflexible, Insuperable, Intractable, Intransigent, Invincible, Inviolable, Invulnerable, Iron, Irreconcilable, Irremovable, Irresistible, Irrevocable, Lasting, Loyal, Massive, Merciless, Mortal, Necessary, Obdurate, Objecting, Obstinate, Obstructive, Orthodox, Overpowering, Overwhelming, Pat, Pertinacious, Pitiless, Protesting, Purist, Puritan, Unswerving, Unsympathetic, Withstanding, Adamant, Bulky, Certain, Complaining, Constant, Cruel, Dense, Disputatious, Disputing, Dissenting, Dour, Rebellious, Recalcitrant, Refractory, Relentless, Reluctant, Remorseless, Repellent, Resistant, Resisting, Resistive, Retardant, Rigid, Rigorous, Rugged, Ruthless, Set, Settled, Solid, Sot, Sound, Stable, Stationary, Staunch, Steadfast, Steady, Steely, Stern, Stiff, Stout, Strong, Stubborn, Sturdy, Sure, Tough, True, Unaffected, Unalterable, Unassailable, Unavoidable, Unbeatable, Unbending, Unchangeable, Uncompromising, Unconquerable, Uncontrollable, Uncooperative, Unfeeling, Unflinching, Unforgiving, Unmoved, Unmoving, Unreceptive, Unrelenting, Unresponsive, Unshaken, Unstoppable
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