flinty Synonyms

flint stony obdurate granitic steely pitiless solid shingly severe ruthless relentless rugged rough rocky rigid stern unsympathetic rocklike rock hard unforgiving unbreakable bouldered unyielding unfeeling unbending tough strong stiff petrous pebbly adamant firm dure dour cruel cherty cemental callous bowelless bouldery austere flintlock forbidding impenetrable merciless lithic lapidarian inflexible indestructible heartless