adamantness dourness firmness flintiness grimness hard-bittenness hard-nosedness immovability immutability implacability impliability inelasticity inexorability inflexibility intransigeance intransigency intransigentism irreconcilability obduracy relentlessness rigidity rigorism steeliness sternness stiff temper stiffness toughness unalterability unbendingness unchangeability uncompromisingness ungivingness unrelentingness unyieldingness