pertinacious Synonyms

unyielding obstinate tenacious stubborn persistent firm dour dogged inflexible determined resolute single-minded spiritful strong-minded stiff-necked staunch steady steadfast unbending uncompromising unbendable strong-willed unswerving unflagging hardheaded pigheaded unwavering tireless untiring willful unshakable unrelenting self-willed sedulous insistent adamant indefatigable importunate immovable headstrong doctrinaire deaf contumacious constant intractable intransigent mulish rigid relentless refractory