rock-ribbed Synonyms

rockbound undaunted tenacious stubborn stiff-necked stiff steely steadfast staunch stalwart spirited unbending uncompromising stubborn as a mule strong-willed unswerving unflagging unwavering dead set unyielding unshakable unrelenting rocky rigid inexorable indefatigable immovable firm dogged determined craggy contrarious brave inflexible insistent intransigent resolute relentless pertinacious persistent persevering pebbly obstinate obdurate lapidarian adamant