overmannered

adjective

over·​man·​nered ˌō-vər-ˈma-nərd 

: having an exceedingly affected style or manner : excessively mannered

… the overmannered air of some of these period pieces …

—Kitty Empire

"… this place, with these overdressed, overmannered women, who ape fine ladies' manners."

—Carolyn Wells

He had not liked the man, had not liked his coldness, his overdressed, overmannered personality.

—Isaac Asimov

Word History

First Known Use

1847, in the meaning defined above