Synonyms to undefeated

invincible, assiduous, beyond compare, beyond comparison, calculable, constant, continuing, deathless, dependable, diligent, dogged, easily first, enduring, facile princeps, faithful, faithworthy, fast, firm, immortal, immutable, impassable, impenetrable, imperishable, impregnable, inalterable, incomparable, incontestable, incorruptible, indefatigable, indelible, indestructible, indomitable, industrious, ineffaceable, ineradicable, inexpugnable, inextinguishable, inimitable, insistent, insuperable, insurmountable, inviolable, invulnerable, irresistible, lasting, loyal, matchless, never-tiring, nonperishable, nulli secundus, obstinate, overpowering, overwhelming, patient, patient as Job, peerless, permanent, perseverant, persevering, persistent, persisting, pertinacious, plodding, plugging, predictable, preoccupied, quenchless, rapt, relentless, reliable, resistless, resolute, second to none, secure, sedulous, single-minded, sleepless, slogging, solid, sound, stable, staunch, steadfast, steady, stubborn, substantial, sui generis, sure, surefire, tenacious, tireless, trustworthy, trusty, unabating, unap