How to describe a person so polite?

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"He is very polite."
"He is always courteous."
For a man, "he is always such a gentleman." For a woman, "she's a real lady."

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Which word can use to describe a person so polite and which behaviours  may you think a person is the politest?Thank you so much!

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You could simply say that a person is "very polite". Courteous, respectful, or well-mannered can be used, too.

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I would say "courteous" most of the time- like :"he is such a courteous person."

Well, there could be more, but I would say this is the most direct method. Simple and easy~

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I don't understand your question :/ What do you want to know?