What is a word for the prefix courteous?

There isn't a single word that perfectly captures the meaning of "courteous" as a prefix.

However, depending on the context, you could consider these options:

* Polite: This is the most common and general synonym for courteous.

* Respectful: This emphasizes the deference and consideration shown.

* Gracious: This highlights the kindness and generosity associated with courtesy.

* Civil: This emphasizes the polite and formal nature of courtesy.

The best word to use depends on the specific nuance you want to convey.

It's also worth noting that "courteous" is more often used as an adjective, not a prefix. You might find it used in phrases like "courteous behavior" or "courteous treatment."