When it comes to antonyms for the word "re-generate," several options come to mind. Firstly, there's "degenerate," meaning to decline or deteriorate in quality or character. The opposite of regeneration, it implies a downward spiral rather than growth or renewal. Another possible antonym is "destroy," meaning to eradicate or eliminate completely. Unlike regeneration, destruction involves the complete annihilation of something, leaving nothing behind. Other antonyms might include words like "decay," "rot," or "wither," which all imply a lack of vitality or energy. Ultimately, the choice of antonym will depend on the context and intended meaning of the word "re-generate".