tenacious Definition

stubborn, unyielding, dogged, bulldog, pertinacious, dour, retentive, long, coherent, adhesive, relentless, tireless, resolute, indefatigable, indomitable, aggressive, diligent, fierce, unrelenting, tough, uncompromising, untiring, staunch, resilient, unwavering, obstinate, steadfast, persistent, strong, unswerving, hard, ardent, assiduous, nasty, diehard, stiff, unshakeable, entrenched, intransigent, insistent, unremitting, sharp, constant, ceaseless, strenuous, deep, adamant, enduring, intractable, sustained, keen, incessant, protracted, nagging, ingrained, firm, deep-rooted, die-hard, feisty, fearless, scrappy, ferocious, courageous, resourceful, gutsy, perseverant, steely, pugnacious, skillful, ruthless, skilful, plucky, industrious, unflappable, dauntless, obdurate, headstrong, forceful, combative, energetic, formidable, spunky, hardworking, stouthearted, implacable, vigorous, unfaltering, passionate, brave, outspoken, assertive, unflagging, doughty, cledgy, wily, crafty, stout, spirited, unselfish, tigerish,