"Fiddlefaddle" is a term used to describe something that is nonsense or foolishness. Synonyms for this word could include phrases like "hogwash," "balderdash," and "poppycock." Other similar words may include "malarkey," "flapdoodle," and "bunkum." These words are often used to dismiss something that is considered to be silly or absurd. However, it's important to keep in mind that using words like this can be accusatory, and may not be the most respectful way to engage with the person or idea in question. While fiddlefaddle and its synonyms can be a fun and lighthearted way to dismiss nonsense, it's important to use language that is kind and respectful towards others.