What is a prefix for not-polite?

There isn't a single perfect prefix for "not-polite," as the concept of politeness is multifaceted. However, here are some prefixes and their possible connotations, depending on the specific aspect of politeness you want to express:

General lack of politeness:

* Un-: This is a common prefix for negating words, but it can sometimes sound too general or harsh.

* Im-: This prefix also negates, but it can be used for more subtle cases of being impolite.

* Dis-: This prefix implies a lack of something, so it could be used for "disrespectful" or "discourteous."

Specific aspects of impoliteness:

* In-: For "inconsiderate," "insensitive," or "inappropriate."

* Rude-: Clearly emphasizes the rudeness aspect.

* Rough-: For those who are blunt and lack tact.

* Boor-: For those who are uncouth and unrefined.

Examples:

* Unpolite

* Impolite

* Discourteous

* Inconsiderate

* Rude

* Rough

* Boorish

The best prefix will depend on the specific context and the nuance you want to convey.