Wiktionary
overpolite
a. excessively polite
Usage examples of "overpolite".
Helen, had glazed yellow hair and the overpolite manner of someone who wishes the atmosphere was a little less casual.
From their initial shock that she was a woman to their inevitable, overpolite awkwardness, waiting for her to sit, waiting for her to talk, then not sitting until she had asked them to, making small talk, not wanting to get down to business, not wishing to negotiate with her as a person, a business person, at all, saying instead that their wives would be delighted to take her shopping, then gaping because she knew all the intimate details of their projected deal.