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14th century, in the meaning defined above
unreprovable from Middle English, from un- entry 1 + reprovable open to reproof, from reproven to reprove + -able
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“Unreprovable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unreprovable. Accessed 27 Jul. 2021.
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