Dictionary 1. (n.) The act of hardening, or the process of growing hard.2. (n.) State of being indurate, or of having become hard. 3. (n.) Hardness of character, manner, sensibility, etc.; obduracy; stiffness; want of pliancy or feeling. Thesaurus Philistinism armor callosity callousness callus flintiness formidable defenses hard heart hard shell hardenedness hardheartedness hardness hardness of heart heart of stone imperviousness insensitiveness insensitivity inuredness obduracy obdurateness rhinoceros hide stoniness thick skin |