The antonyms for the word "regenerate" can be described as the opposite meaning of regeneration, which includes words such as decline, deteriorate, weaken, deteriorate, break down, or worsen. These antonyms refer to the opposite process, in which something loses its strength, intensity, or power, and decays over time. For example, a decaying building, a weakening economy, or a deteriorating relationship can be considered antonyms of regeneration. In essence, antonyms provide a contrasting, negative meaning, which is essential in improving our understanding of a particular word, its context, and its usage in language.