overmannered

/ˌoʊvərˈmænərd/
adjective
  1. Having or showing manners that are too formal, elaborate, or artificial; excessively polite or stylized.
    • His overmannered bow at the dinner seemed more like a performance than a greeting.
    • She found his overmannered compliments insincere and uncomfortable.
    • The novel's overmannered dialogue made the characters feel unrealistic.
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