Adamant, Adherent, Adhesive, Assiduous, Bigoted, Cantankerous, Chewy, Cohesive, Constant, Continuing, Determined, Diligent, Dogged, Dogmatic, Dour, Durable, Enduring, Faithful, Fanatic, Fibrous, Firm, Fundamentalist, Gluey, Glutinous, Hard, Hardheaded, Hardy, Headstrong, Hidebound, Immovable, Immutable, Indefatigable, Indomitable, Industrious, Inelastic, Inexorable, Inextensible, Inflexible, Insistent, Unflinching, Uninterrupted, Unregenerate, Unrelenting, Unremitting, Unswerving, Untiring, Unwavering, Unwearied, Unyielding, Vigorous, Wayward, Wiry, Insubordinate, Intolerant, Intractable, Intransigent, Invincible, Iron, Lasting, Leathery, Loyal, Obdurate, Obstinate, Opinionated, Orthodox, Patient, Permanent, Persevering, Persistent, Persisting, Pertinacious, Plodding, Plugging, Preoccupied, Purist, Puritan, Rapt, Rebellious, Recalcitrant, Refractory, Relentless, Resistant, Resolute, Restive, Rigid, Rigorous, Set, Sinewy, Sleepless, Slogging, Stable, Steadfast, Steady, Sticky, Stiff, Stringy, Strong, Stunt, Sulky, Sullen, Tacky, Tenacious, Tireless, Tough, Unalterable, Unbending, Uncompromising, Unconquerable, Uncooperative, Undaunted, Unfailing, Unflagging
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