Firm, Immortal, Immutable, Impassable, Impenetrable, Imperishable, Impregnable, Incomparable, Incontestable, Incorruptible, Indefatigable, Indelible, Indestructible, Indomitable, Industrious, Ineradicable, Inextinguishable, Inimitable, Insistent, Insuperable, Insurmountable, Inviolable, Invulnerable, Irresistible, Lasting, Loyal, Matchless, Obstinate, Overpowering, Overwhelming, Patient, Peerless, Permanent, Persevering, Persistent, Persisting, Pertinacious, Plodding, Plugging, Predictable, Preoccupied, Rapt, Relentless, Reliable, Resolute, Secure, Sleepless, Slogging, Solid, Sound, Stable, Staunch, Steadfast, Steady, Stubborn, Substantial, Sure, Tenacious, Tireless, Trustworthy, Trusty, Unapproachable, Unassailable, Unbeatable, Unconquerable, Undaunted, Undefeated, Undying, Assiduous, Calculable, Constant, Continuing, Deathless, Dependable, Diligent, Dogged, Enduring, Faithful, Fast, Unfailing, Unflagging, Unflinching, Uninterrupted, Unique, Unmatchable, Unmatched, Unparalleled, Unquenchable, Unrelenting, Unremitting, Unstoppable, Unsurpassable, Unsurpassed, Unswerving, Untiring, Untouchable, Unwavering, Unwearied, Unyielding
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