* Impolite: Meaning rude or disrespectful.
* Unpolite: Meaning not polite, similar to impolite.
* Superpolite: Meaning extremely polite or excessively polite.
* Hyperpolite: Similar to superpolite, meaning extremely polite.
* Prepolite: This is a less common prefix but could mean something like "before being polite" or "proto-polite"
The best prefix depends on the meaning you want to convey.