overliterary

/ˌoʊvərˈlɪtəreri/
adjective
  1. Using or involving an overly elaborate, bookish, or formal style of language, often in a way that seems unnatural or pretentious.
    • The email was so overliterary that it was hard to understand.
    • She avoided overliterary phrases in her blog to keep it friendly.
    • His overliterary speech made him sound like a character from a novel.