Polysyllabically is an adverb that describes the use of many syllables in a word or phrase. However, if you are looking for some synonyms to avoid repetition in your writing, you might consider using words like "multisyllabically," "polyphonically," "multiplicatively," "diffusely," "prolixly," or "long-windedly." Each of these words expresses the idea of an extended or complicated use of language in a different way, allowing you to vary your phrasing and style to fit the context of your writing. Whether you are a student, a professional, or a creative writer, diversifying your vocabulary can help you engage your readers and communicate effectively.