(n.) The quality of being steely.

Philistinism analgesia anesthesia armor callosity callus coldbloodedness coldheartedness coldness deadness density dullness durity electronarcosis flintiness formidable defenses hard heart hard shell hardenedness hardheartedness hardness hardness of heart heart of stone heartlessness impassibility impenetrability impenitence impenitentness imperception imperceptiveness imperceptivity impercipience imperviousness inconsiderateness induration insensibility insensibleness insensitiveness insensitivity insentience insolence inuredness irrepentance narcosis narcotization nonrepentance numbness obduracy obdurateness obtuseness pins and needles pitilessness resistance restiveness rhinoceros hide seared conscience solidity steeliness stoniness thick skin toughness unabjectness uncontriteness unfeeling unfeelingness unmercifulness unnaturalness unperceptiveness unresponsiveness