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Use "arduousness" in a sentence
"But presumption fails to honor this distinction, and therefore "fails to accept the reality of the futurity and 'arduousness' that characterize" our journey in and toward O."
"Even Charles Dickens, God love him, has a writing style that seems dated and can inspire more arduousness than avidness."
"I visited them that April during lambing, and was so taken with the magnitude of their life -- at once its allure and its arduousness -- that we ended up working with them, their friends, and their Irish-American hired hands intensively over the coming years."