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Use "indomitableness" in a sentence
"The set of his mouth, his chin, his jaw, was likewise firm or harsh, with all the fierceness and indomitableness of the male — the nose also."
"Receiving by heredity the fierce, bull-like nature of his father plus the passive indomitableness and groping spirit of his mother, Fomá, proud and rebellious, is repelled by the selfish, money-seeking environment into which he is born."
"It is a testament to the indomitableness of these two men, if not to the entire human spirit, that Malone and Murdoch are still standing and in relative good humor after their struggles."