steely Synonyms

severe firm unrelenting unfeeling stubborn grim hard tough implacable inflexible intransigent iron stern steel steadfast unyielding determined resolute cold-blooded lead-colored stony stiff rocklike rock-ribbed unsmiling unstoppable unyielded solid slaty iron-willed silvered ruthless rugged rigid strong emotionless dead set creaky unadaptable blue-gray weathered blue-grey unwavering unflexible unbreakable unswerving tough-minded unbending strong-willed toned