Tenacious1. (a.) Holding fast; persistent; stubborn; obstinate; inclined to retain what is in possession; as, men tenacious of their just rights.
2. (a.) Apt to retain; retentive; as, a tenacious memory.
3. (a.) Having parts apt to adhere to each other; cohesive; tough; as, steel is a tenacious metal; tar is more tenacious than oil.
4. (a.) Apt to adhere to another substance; glutinous; viscous; sticking; adhesive.
5. (a.) Niggardly; closefisted; miserly.
6. (a.) Holding stoutly to one's opinion or purpose; obstinate; stubborn.
Thesaurus Entries
adamant, adherent, adhesive, amylaceous, assiduous, balking, balky, bigoted, bound, bound and determined, bulldogged, bulldoggish, bulldoggy, bulletheaded, bullheaded, cartilaginous, case-hardened, chewy, clabbered, clammy, clinging, clingy, clotted, coagulated, cohesive, committed, constant, continuing, coriaceous, curdled, decided, decisive, dedicated, definite, determined, devoted, diligent, dogged, dogmatic, doughy, durable, earnest, enduring, faithful, fanatic, fibrous, firm, fixed, game, gamy, gaumy, gelatinous, glairy, gluelike, gluey, glutenous, glutinose, glutinous, good, gooey, grasping, gripping, gristly, gritty, grumous, gumbo, gumbolike, gumlike, gummous, gummy, gutsy, gutty, hard, hardheaded, hardy, headstrong, heavy, holding, immovable, immutable, inalterable, indefatigable, indomitable, industrious, inflexible, insistent, inspissated, intolerant, intransigent, invincible, jelled, jellied, jellylike, keeping, lasting, leatherlike, leathery, loyal, maintaining, mettlesome, mucilaginous, mulish, nervy, never-tiring, obdurate, obstinate, opinionated, overzealous, pasty, patient, patient as Job, permanent, perseverant, persevering, persistent, persisting, pertinacious, pigheaded, plodding, plucky, plugging, preoccupied, purposeful, rapt, red-blooded, refractory, relentless, resistant, resolute, resolved, restive, retaining, retentive, rigid, ropy, secure, sedulous, self-adhesive, self-willed, serious, set, sincere, sinewy, single-minded, slabby, sleepless, slimy, slithery, slogging, spirited, spiritful, spunky, stable, stalwart, starchy, staunch, steadfast, steady, stickable, sticky, stiff, stiff-necked, stodgy, stout, stringy, strong, strong-minded, strong-willed, strongheaded, stubborn, sturdy, sulky, sullen, syrupy, tacky, thick, thickened, tight, tireless, tough, tough as leather, tremelloid, tremellose, TRUE, unabating, uncompromising, unconquerable, uncooperative, undaunted, undiscouraged, undrooping, unfailing, unfaltering, unflagging, unflinching, unintermitting, uninterrupted, unnodding, unregenerate, unrelaxing, unrelenting, unremitting, unshakable, unshakeable, unshaken, unsleeping, unswerving, untiring, unwavering, unwearied, unwearying, unwinking, unyielding, utterly attentive, vigorous, viscid, viscose, viscous, weariless, wholehearted, willful, wiry