obdurate Synonyms

obstinate unrepentant hardened unyielding flinty hard firm inflexible cussed unbending stubborn intractable callous stony unswayable pigheaded unsparing unshakable unrelenting unregenerate unfeeling unmerciful unregenerated uncompromising unblushing self-willed set single-minded steadfast steely stiff stiff-necked unsentimental strong-minded tenacious thick-skinned tough toughened rigorist wayward wilful willful unswerving unforgiving strong-willed unremorseful rocklike rock-ribbed stonyhearted unchallengeable