indomitableness

noun

1. (uncountable)The state or quality of being indomitable.

   “Nor, will the tragic dramatist who would depict mortal indomitableness in its fullest sweep and direct swing, ever forget a hint, incidentally so important in his art, as the one now alluded to.”

   “In the indomitableness and audacity of his will, he defies not only man but God himself.”