Tenaciously unwilling or marked by tenacious unwillingness to yield.

synonyms: obstinate, unregenerate.

Roget 606: obstinate, tenacious, stubborn, obdurate, casehardened; inflexible etc. (hard) 323; balky; immovable, unshakable, not to be moved; inert etc. 172; unchangeable etc. 150; inexorable etc. (determined) 604; mulish, obstinate as a mule, pig-headed.    dogged; sullen, sulky; unmoved, uninfluenced unaffected.    willful, self-willed, perverse; resty^†, restive, restiff^†; pervicacious^†, wayward, refractory, unruly; heady, headstrong; entete [Fr.]; contumacious; crossgrained^†.    arbitrary, dogmatic, positive, bigoted; prejudiced etc. 481; creed-bound; prepossessed, infatuated; stiff-backed, stiff necked, stiff hearted; hard-mouthed, hidebound; unyielding; impervious, impracticable, inpersuasible^†; unpersuadable; intractable, untractable^†; incorrigible, deaf to advice, impervious to reason; crotchety etc. 608.    ... show more

Roget 323: hard, rigid, stubborn, stiff, firm; starch, starched; stark, unbending, unlimber, unyielding; inflexible, tense; indurate, indurated; gritty, proof.    adamant, adamantine, adamantean^†; concrete, stony, granitic, calculous, lithic^†, vitreous; horny, corneous^†; bony; osseous, ossific^†; cartilaginous; hard as a rock etc. n.; stiff as buckram, stiff as a poker; stiff as starch, stiff as as board.    ... show more

Roget 159: strong, mighty, vigorous, forcible, hard, adamantine, stout, robust, sturdy, hardy, powerful, potent, puissant, valid.    resistless, irresistible, invincible, proof against, impregnable, unconquerable, indomitable, dominating, inextinguishable, unquenchable; incontestable; more than a match for; overpowering, overwhelming; all powerful, all sufficient; sovereign.    able-bodied; athletic; Herculean, Cyclopean, Atlantean^†; muscular, brawny, wiry, well-knit, broad-shouldered, sinewy, strapping, stalwart, gigantic.    manly, man-like, manful; masculine, male, virile.    unweakened^†, unallayed, unwithered^†, unshaken, unworn, unexhausted^†; in full force, in full swing; in the plenitude of power.    stubborn, thick-ribbed, made of iron, deep-rooted; strong as a lion, strong as a horse, strong as an ox, strong as brandy; sound as a roach; in fine feather, in high feather; built like a brick shithouse; like a giant refreshed.    ... show more

Roget 327: tenacious, tough, strong, resisting, sequacious^†, stringy, gristly cartilaginous, leathery, coriaceous^†, tough as whitleather^†; stubborn etc. (obstinate) 606.    unbreakable, indivisible; atomic.    ... show more

Polish: uparty

Not responding to treatment:
— A stubborn infection.
— Stubborn rust stains.

synonym: refractory.

Roget 704: difficult, not easy, hard, tough; troublesome, toilsome, irksome; operose^†, laborious, onerous, arduous, Herculean, formidable; sooner said than done; more easily said than done, easier said than done.    difficult to deal with, hard to deal with; ill-conditioned, crabbed, crabby; not to be handled with kid gloves, not made with rose water.    awkward, unwieldy, unmanageable; intractable, stubborn etc. (obstinate) 606; perverse, refractory, plaguy^†, trying, thorny, rugged; knotted, knotty; invious^†; pathless, trackless; labyrinthine etc. (convoluted) 248; intricate, complicated etc. (tangled) 59; impracticable etc. (impossible) 471; not feasible etc. 470; desperate etc. (hopeless) 859.    embarrassing, perplexing etc. (uncertain) 475; delicate, ticklish, critical; beset with difficulties, full of difficulties, surrounded by difficulties, entangled by difficulties, encompassed with difficulties.    under a difficulty; in a box; in difficulty, in hot water, in the suds, in a cleft stick, in a fix, in the wrong box, in a scrape etc. n., in deep water, in a fine pickle; in extremis; between two stools, between Scylla and Charybdis; surrounded by shoals, surrounded by breakers, surrounded by quicksands; at cross purposes; not out of the wood.    reduced to straits; hard pressed, sorely pressed; run hard; pinched, put to it, straitened; hard up, hard put to it, hard set; put to one's shifts; puzzled, at a loss, etc. (uncertain) 475; at the end of one's tether, at the end of one's rope, at one's wit's end, at a nonplus, at a standstill; graveled, nonplused, nonplussed, stranded, aground; stuck fast, set fast; up a tree, at bay, aux abois [Fr.], driven into a corner, driven from pillar to post, driven to extremity, driven to one's wit's end, driven to the wall; au bout de son Latin; out of one's depth; thrown out.    accomplished with difficulty; hard-fought, hard-earned.    ... show more

Roget 719: resisting etc. v.; resistive, resistant; refractory etc. (disobedient) 742; recalcitrant, renitent; up in arms.    repulsive, repellant.    proof against; unconquerable etc. (strong) 159; stubborn, unconquered; indomitable etc. (persevering) 604.1; unyielding etc. (obstinate) 606.    ... show more