Antonyms for the word "alters to" can include phrases like "remains the same" or "stays unchanged." Other possible antonyms might include terms like "preserves," "maintains," or "keeps constant." Alternatively, it might be possible to find antonyms that suggest a different kind of transformation, such as "transforms into" or "evolves into." Ultimately, the choice of antonym will depend on the specific context in which the word "alters to" is being used, as well as the overall tone of the sentence or paragraph. Whether describing a physical change, an emotional transition, or a philosophical transformation, there are numerous ways to find antonyms that provide a clear contrast to the idea of something altering or changing into something else.