The state or quality of being unwarrantable.(noun)
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Use "unwarrantableness" in a sentence
"She had, moreover, a general air of proclaiming the unwarrantableness of railway acquaintances, which alone would have prevented Peter from asking the girl, as he absurdly wanted to, if they had painted the new school-house yet, and if there had been much water that year in Miller's pond."
"If it was the conscience and conviction of the unwarrantableness of it for the want of authority, that stirred them up to oppose the covenant and cause, then why did they subscribe it and join in the defence of the same against the king?"