Assiduous, Brave, Constant, Continuing, Courageous, Dauntless, Defiant, Determined, Diligent, Dogged, Enduring, Faithful, Fearless, Fractious, Immutable, Impassable, Impenetrable, Impregnable, Unswerving, Untiring, Unwavering, Unwearied, Unyielding, Wild, Incontestable, Incorrigible, Indefatigable, Industrious, Insistent, Insuperable, Insurmountable, Intractable, Intrepid, Invincible, Inviolable, Invulnerable, Irrepressible, Irresistible, Lasting, Loyal, Obstinate, Obstreperous, Overpowering, Overwhelming, Patient, Permanent, Persevering, Persistent, Persisting, Pertinacious, Plodding, Plucky, Plugging, Preoccupied, Rapt, Recalcitrant, Refractory, Relentless, Resistant, Resisting, Resolute, Resolved, Restive, Sleepless, Slogging, Stable, Staunch, Steadfast, Steady, Stubborn, Tenacious, Tireless, Unafraid, Unassailable, Unbeatable, Unconquerable, Uncontrollable, Undaunted, Undisciplined, Unfailing, Unflagging, Unflinching, Ungovernable, Uninterrupted, Unmanageable, Unrelenting, Unremitting, Unruly, Unstoppable
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