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Definition of obstinate : 1. Not yielding; not easily subdued or removed; as, obstinate fever; obstinate obstructions.
2. Pertinaciously adhering to an opinion, purpose, or course; persistent; not yielding to reason, arguments, or other means; stubborn; pertinacious; - usually implying unreasonableness.

Synonyms:

perverse, invariable, heady, inconvincible, whatever happens, self-opinionated, disorderly, constant, final, unruly, adverse, unreasoning, positive, unflinching, opinionative, uncontrollable, narrow, resolved, irreversible, obstreperous, self-willed, dogmatic, unchanging, reprobate, granitic, unvarying, unmanageable, wild, perverted, unreformable, impenitent, ungovernable, control, resist, unreconstructed, lawless, pat, crotchety, case-hardened, peace, contumacious, implacable, untoward, willful, closed, biased, unreasonable, fractious, unregenerate, wayward, contradictory, strong-minded, immovable, flint, cussed, continue, undisciplined, refractory, opinionated, fixed, adamantine, unrepentant, intractable, unrelenting, pigheaded, unwavering, conservative, die-hard, flinty, unamenable, unalterable, indocile, prejudiced, repulsive, ossified, disobedient, for good, convinced, firm, unregenerated, depraved, unimpressible, unconquerable, restive, callous, order, intransigent, bloody-minded, hellbent, hardened, narrow-minded, unremorseful, decided

contrary, bovine, pertinacious, mulish, brass-bound, bigoted, resolute, inelastic, stubborn, tenacious, unbendable, unyielding, bull-headed, hardheaded, hard-nosed, adamant, pig-headed

demanding, rigid, austere, fundamental, gruff, rigorous, brusque, dry, uncompromising, precise, curt, piquant, correct, brisk, chilly, obdurate, icy, stiff-necked, bleak, meticulous, disciplined, cutting, spare, stringent, hidebound, blunt, caustic, censorious, keen, cool, tart, exacting, basic, acute, sharp, ascetic, acerbic, imperial, raw, astringent, prudish, lean, severe, frosty, Spartan, Draconian, harsh, acrimonious, unbending, intense, puritanical, oppressive, intolerant, critical, authoritarian, short, abrupt, strict, stern, relentless, stark, inflexible, crisp, grim, strait-laced, dour

conflicting, bold, dissenting, daring, insolent, factious, recalcitrant, insubordinate, challenging, confrontational, insurgent, resistant, audacious, defiant, rebellious

mean, moping, beetle-browed, morose, long-faced, unfriendly, glowering, frowning, crabby, grouchy, melancholy, glum, hostile, irascible, sullen, sour, grumpy, dejected, unsociable, ungenial, gloomy, broody, surly, cantankerous, cynical, cross, sulky, malevolent, scowling, fretful, dissociable, moody, dark, petulant

loath, indisposed, unconsenting, squeamish, resisting, balky, noncooperative, averse, irreconcilable, non-consenting, unhelpful, reluctant, opposed, disinclined, unwilling, uncomplying, uncooperative, hesitant

fervent, indomitable, hearty, plucky, enduring, decisive, persevering, devoted, determined, strong-willed, flintlike, faithful, courageous, spunky, tireless, tough, hard, persistent, brave, headstrong, bulldogged, steadfast, staunch, stiff, stony, indefatigable, strong, diligent, undaunted, true, dauntless, dogged, insistent, unflagging, bullheaded

Usage examples:

• In one of your letters, written long since- I don't suppose you remember it- you told me that I was an obstinate man when I once took a thing into my head. - "Blind Love", Wilkie Collins.
• But she became unexpectedly obstinate. - "No Charge for Alterations", Horace Leonard Gold.
• You obstinate little block! - "Life on the Stage", Clara Morris.