- pertinacious
- adj1. stubborn, Inf. ornery, pigheaded, mulish, stubborn as a mule; unyielding, intractable, obdurate, obstinate; inflexible, unbending, adamant, adamantine, rigid, stony, fixed, stiff, stiff-necked; unswerving, undeviating, uncompromising, relentless, unrelenting, unshrinking, stern; perverse, opinionated, headstrong, self-willed, willful, per-vicacious; refractory, contrary, intransigent; unmanageable, ungovernable, immovable, unshakable.2. persistent, insistent, tenacious, bulldog, dogged, determined; persevering, steadfast, staunch, stalwart; resolute, purposeful, purposive, firm; tough, tough-minded, plucky, stout, sturdy, sturdy as the Rock of Gibraltar, strong; enduring, patient, with the patience of Job, lasting, game, game to the last; assiduous, sedulous, diligent, industrious; constant, unremitting, unwavering, continuous, continuing; tireless, untiring, unsleeping, unwearying, indefatigable; unflagging, undrooping, unflinching, unfaltering.
A Note on the Style of the synonym finder. 2014.