What was the longest word that sunny baudelaire said?

There's no single longest word explicitly stated as being said by Sunny Baudelaire in the _A Series of Unfortunate Events_ books.

Here's why:

* Sunny's Age: Sunny is a baby throughout the series, and her vocabulary is limited to babbling and a few understandable words.

* Focus on Actions: The books emphasize Sunny's actions and the cleverness of her teeth, rather than focusing on her exact spoken words.

* Author's Intent: Lemony Snicket, the narrator, doesn't always provide precise dialogue, instead focusing on the overall events and their impact.

While we don't know her exact longest word, it's safe to assume it was short and likely something like "mama," "dada," or "cookie," reflecting a typical baby's vocabulary.