tenacious Synonyms

coherent dour unyielding retentive steadfast persistent sticky pertinacious dogged single-minded stiff stiff-necked strong strong-minded stubborn undaunted uncompromising tuff trojan tough tireless sustained sturdy unflinching sticking recollective redoubtable relentless resolved robust scrappy sedulous self-assertive self-willed set soldered spirited spiritful staunch resolute purposeful unregenerate unrelenting feist hardheaded unflagging unswerving undeterred clingsome strong-willed