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Definition of obdurate: 1. Hard; harsh; rugged; rough; intractable.
2. Hardened in feelings, esp. against moral or mollifying influences; unyielding; hard-hearted; stubbornly wicked.
3. To harden.

Synonyms:

unconquerable, refractory, immovable, bouldered, rocklike, unflinching, attitude, unregenerated, intransigent, implacable, compassionless, stonyhearted, opinionated, cussed, granitelike, adamantine, hardened, cold-hearted, unremorseful, hardhearted, firm, cold-blooded, iron, unregenerate, brassbound, rocky, uncompliant, unfeeling, flint, die-hard, flinty, bouldery, unrelenting, wayward, study at inflexible, heartless, unrepentant, fixed, callous, inexorable, heady, resist, hard-boiled, decided, remorseless, resolved, intractable, granitic, impenitent, incompliant, perverse, contumacious

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

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

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