pertinacious Synonyms

unyielding resolute tenacious obstinate inflexible stubborn firm dour dogged determined persistent steadfast sedulous self-willed single-minded spiritful strong-minded stiff-necked staunch stiff steady tireless unbending unbendable unchallengeable rock-ribbed strong-willed unswerving unflagging hardheaded pigheaded unwavering untiring willful unshakable unrelenting uncompromising unfaltering rigid relentless indefatigable inconvincible incompliant importunate immovable headstrong doctrinaire deaf contumacious constant