steadfast Synonyms

steady unswerving firm unfaltering unshakable stiff unwavering staunch tireless tenacious sustained unflinching sturdy stubborn tolerant true unfailing undaunted unconquerable unconditional uncompromising unbending unaffected trusty trustworthy true-blue strong-minded strong stout-hearted single-minded settled set serious sedulous secure robust rigid retentive sound stable stoic stiff-necked steely staying static standing stalwart staid stabler resolved