callousness (n.)

• analgesia
• anesthesia
• armor
• callosity
• callus
• coldheartedness
• coldness
• deadness
• density
• dullness
• hardheartedness
• hardness
• heartlessness
• impenetrability
• impenitence
• imperviousness
• inconsiderateness
• induration
• insensibility
• insensitiveness
• insensitivity
• insentience
• insolence
• narcosis
• numbness
• obduracy
• obtuseness
• pitilessness
• resistance
• restiveness
• solidity
• toughness
• unfeelingness
• unmercifulness
• unnaturalness
• unperceptiveness
• unresponsiveness