tenacious

1 continuing despite difficulties, opposition, or discouragement a tenacious trainer, she adheres to her grueling swimming schedule no matter what Synonyms dogged, insistent, patient, persevering, pertinacious, persistentRelated Words assured, certain, dedicated, determined, firm, hell-bent, intent, positive, resolute, resolved, single-minded, sure; adamant, bullheaded, dogged, hardened, hardheaded, headstrong, implacable, indurate, mulish, obdurate, obstinate, opinionated, peevish, pertinacious, perverse, pigheaded, self-willed, stiff-necked, stubborn, unregenerate, unyielding, willful (or wilful); unfaltering, unhesitating, unwavering; resistant, wayward, wrongheaded; constant, devoted, faithful, good, loyal, staunch (also stanch), steadfast, steady, true; indomitable, unconquerable; hard, inflexible, relentless, stern, unbending, unflinching, unrelentingNear Antonyms quitting, surrendering, yielding; faltering, hesitant, hesitating, irresolute, vacillating, wavering; disloyal, faithless, false, fickle, inconstant, perfidious, traitorous, treacherous

2 tending to adhere to objects upon contact you'll have a devil of a time getting those tenacious burrs off of your wool sweater Synonyms adherent, adhesive, clingy, gluey, glutinous, gummy, tacky, sticky, viscidRelated Words gelatinous, gooey, ropy (also ropey), syrupy, viscous; pitchy, tarryNear Antonyms nonviscousAntonyms nonadhesive