What is another word for courteous?
Pronunciation: [kˈɜːti͡əs] (IPA) 
There are plenty of synonym options available for the word "courteous," all of which convey a sense of good manners and polite behavior. Some of the most common synonyms include polite, civil, gracious, well-mannered, respectful, considerate, cordial, affable, charming, and gallant. Each of these words puts a slightly different spin on the concept of being courteous, with some emphasizing the importance of good manners and others highlighting the positive social interactions that result from courteous behavior. Ultimately, the word choice will depend on the context and tone of the writing, but any of these synonyms would be a great alternative to "courteous".
