Re-proving refers to the act of proving something again or demonstrating its validity. Antonyms for the word re-proving would be words that express the opposite, such as discrediting, invalidating, or refuting. Discrediting implies casting doubt on the truth or reliability of something, while invalidating means making something void or null. Refuting denotes the act of proving that something is false or incorrect. When it is unnecessary to prove something again or when a previous proof is sufficient, words like confirming, verifying, and validating become synonymous with re-proving. Therefore, depending on the context, antonyms of re-proving could have different meanings.