Gibble-gabble is a term often used to describe nonsensical or meaningless talk. However, there are several other synonyms that can be used in its place. For example, you could use the term babble to describe someone talking incessantly without saying anything of substance. Similarly, if you want to describe someone who talks in a confusing way, you could use the term jargon or gobbledygook. Nonsense, drivel, and twaddle are also useful synonyms for gibble-gabble. Ultimately, it's important to choose the right synonym based on the context in which it will be used. This will help ensure that the message you're trying to convey is clear and effective.