Synonyms for Steadfast:

adj.

abiding (adjective)
permanent, enduring, steady, lasting, persistent.
ardent (adjective)
devoted.
brave (adjective)
valiant.
certain (adjective)
indubitable, certain, decisive, convinced, set, clear, unequivocal, absolute, irrefutable, incontestable, positive, incontrovertible, sure, indisputable, assured, undoubted, doubtless, unquestionable, unmistakable, decided, patent, trusting, undeniable, Irrefragable, confident, definite, veritable.
constant (adjective)
consistent, invariable.
dependable (adjective)
certain, trustworthy, loyal.
determined (adjective)
serious, tenacious, resolved, strong-minded, obstinate, set, earnest, decided, decisive, solid, strong-willed, dogged.
devoted (adjective)
zealous.
diligent (adjective)
indefatigable, unflagging, tireless.
dogged (adjective)
bullheaded, unshakable, insistent.
hard-line (adjective)
stern.
liege (adjective)
liege.
obstinate (adjective)
obstinate.
persevering (adjective)
persevering, lasting, brave, patient, persistent, unwavering, surviving, unflagging, unfaltering, indefatigable, indomitable, enduring, tenacious, stoical, abiding.
reliable (adjective)
trustworthy.
resolute (adjective)
dedicated, unyielding, diligent, ruthless, indomitable, hearty, inexorable, intent, earnest, reliable, insistent, unshakeable, fearless, faithful, relentless, strong-minded, set, steely, unchangeable, strong-willed, resolute, serious, indefatigable, stern, deliberate, implacable, decisive, true, spunky, committed, plucky, bullheaded, bold, zealous, persevering, unwavering, unbending, willing, resolved, decided, tough, determined, staunch, thorough, persistent, steady, iron-willed, headstrong, firm, devoted, loyal, tenacious, tireless, constant, uncompromising, stubborn, valiant, dogged, courageous, unflinching, dauntless.
stable (adjective)
solid, changeless, continuous, stable, set, immovable, durable, steady, firm, invariable, constant, persistent, consistent, permanent.
steadfast (adjective)
enduring, stubborn, unbending, staunch, inexorable, sure, changeless, unswerving, intent, unflinching, liege, dedicated, unfaltering, reliable, unmovable, abiding, unwavering, stable, allegiant, obdurate, persevering, constant, unyielding, relentless, faithful, resolute, firm, true, immovable.
strong (adjective)
iron-willed.
tenacious (adjective)
obdurate, headstrong, dogged, stiff, persistent, staunch, tireless, enduring, obstinate, persevering, stony, undaunted, devoted, spunky, decisive, strong, strong-willed, indomitable, determined, brave, indefatigable, hard, tenacious, insistent, hearty, bullheaded, fervent, dauntless, tough, faithful, diligent, stubborn, courageous, true, resolute, bulldogged, bold, flintlike, unflagging, plucky.
untiring (adjective)
indefatigable.

n.

unmoving, move, unmovable, stationary. continue, steady-going. purpose. allegiant, trust, liege. loyal (noun)
diehard, trustworthy, stalwart.
steadfast (noun)
unbendable, steady, unwavering, unswerving, staunch, firm, resolute, unfaltering, constant, unshakable.

Other synonyms:

allegiant, unmovable, steady-going. liege, unmoving. stationary. loyal
diehard, stalwart.
Other relevant words:
trustworthy, unswerving, steady-going, unmoving, stationary, unbendable, stalwart, allegiant, diehard, unmovable, unshakable, liege.

Usage examples for steadfast

  1. If I had taken her at her word I should have been a steadfast lover, and I do not think it would have taken me long to make her forget her former admirer. – The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons by Jacques Casanova de Seingalt
  2. Next summer we must all perish because so few among us have heard the call, and because those who have heard it have not continued steadfast – Jerusalem by Selma Lagerlöf
  3. She looked long and fixedly upon him, as he stood before her in his Oriental robe, and folded arms, and steadfast and haughty brow. – The Last Days of Pompeii by Edward George Bulwer-Lytton