indomitableness means the state or quality of being indomitable. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Why “indomitableness” is a great word
INDOMITABLENESS — [Noun] The quality of being incapable of being subdued or conquered. From the adjective 'indomitable' (from Late Latin indomitābilis, from Latin in- 'not' + domitāre 'to tame') + the noun-forming suffix '-ness'. Unlike "perseverance," which implies steady persistence through difficulty, or "resilience," which suggests a capacity to recover from being bent, indomitableness is the bedrock that does not bend. It is the granite cliff that remains while the storm exhausts itself, the unbroken stare of a captive that will not accept its cage, the immovable flame that gusts only make brighter—a quiet, innate refusal to ever acknowledge the possibility of defeat.
noun
- 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.”