A nine-letter word for polite and kind is "courteous." This adjective describes someone who is respectful, considerate, and well-mannered in their interactions with others. It implies a sense of politeness and thoughtfulness in behavior and speech.
congenial
One possibility is... courteous
Type your answer here... courteous
A seven-letter word for excessively polite is the word "genteel."
congruent
joy
Sir
Considerate.
Loudmouth
polite
Polite is a 6-letter word that is the opposite of rude.
The nine letter word is nectarine.