adamant, adherent, adhesive, adversary, adversative, adverse, alien, antagonistic, anti, antipathetic, antithetic, assiduous, balking, balky, beefy, bigoted, bloody-minded, bouncing, bound, bound and determined, bulldogged, bulldoggish, bulldoggy, bulletheaded, bullheaded, case-hardened, clashing, clingy, closed-minded, closed to, committed, competitive, con, conflicting, constant, continuing, contradictory, contrary, contumacious, costive, counter, crabbed, cross, deaf, decided, decisive, dedicated, definite, determined, devoted, diligent, disaccordant, disobedient, dissentient, dogged, dogmatic, doughty, dour, earnest, enduring, enemy, faithful, fanatic, firm, fixed, forceful, forcible, forcy, fractious, froward, full-blooded, full-strength, fundamentalist, gluey, glutinous, gummy, gutsy, gutty, hale, hard, hard as nails, hardheaded, hardy, headstrong, hearty, hefty, hidebound, hostile, husky, immovable, immutable, impersuadable, impersuasible, impervious, impliable, inalterable, indefatigable, indisciplined, indomitable, industrious, inexorable, inflexible, inimical, insistent, intolerant, intractable, intransigent, invincible, iron-hard, iron, ironbound, ironclad, ironhanded, lasting, lawless, loyal, lusty, mighty, mulish, muscle-bound, naughty, negative, nervy, never-tiring, nonconforming, noncooperative, obdurate, obstipated, opinionated, opponent, opposed, opposing, opposite, oppositional, oppositive, oppugnant, orthodox, overthwart, overzealous, patient, patient as Job, permanent, perseverant, persevering, persistent, persisting, pertinacious, perverse, pigheaded, plodding, plugging, potent, powerful, preoccupied, procrustean, puissant, purist, puristic, puritan, puritanic, purposeful, rapt, rebellious, recalcitrant, recusant, red-blooded, refractory, relentless, renitent, repugnant, resistant, resolute, resolved, restive, rigid, rigorist, rigoristic, rigorous, rival, robust, robustious, rockbound, rugged, sedulous, self-adhesive, self-willed, serious, set, sincere, single-minded, sleepless, slogging, sot, stable, stalwart, staunch, steadfast, steady, steely, stickable, sticky, stiff-necked, stiff, stony, stout, straightlaced, straitlaced, strapping, strong-willed, strong, strong as brandy, strong as strong, strongheaded, stubborn, sturdy, sulky, sullen, tacky, tenacious, tireless, tough, transgressive, unabating, unamenable, unbending, unchangeable, uncomplying, uncompromising, unconquerable, uncooperative, undaunted, undisciplined, undiscouraged, undrooping, unduteous, undutiful, unfailing, unfaltering, unfavorable, unflagging, unflinching, unfriendly, unimpressionable, uninfluenceable, unintermitting, uninterrupted, unmovable, unmoving, unnodding, unpersuadable, unpliable, unpliant, unpropitious, unreceptive, unregenerate, unrelaxing, unrelenting, unremitting, unresponsive, unsleeping, unsubmissive, unsuggestible, unsusceptible, unswayable, unswerving, untiring, unwavering, unwearied, unwearying, unwinking, unyielding, utterly attentive, vigorous, violative, viscid, wayward, weariless, wholehearted, willful, withstanding, wrongheaded