The antonyms for the word "most unpretended" imply an artificial, affected, or insincere demeanor. Words like "pretentious," "phony," "put-on," and "fake" come to mind. Someone who is "pretentious" acts as if they are more important or knowledgeable than they really are. People who are "phony" or "put-on" pretend to be someone they are not, often to deceive or impress others, while "fake" implies that they are not genuine or authentic. These antonyms for "most unpretended" describe individuals whose actions and intentions are not honest or sincere, lacking the genuine and straightforward demeanor of those who are unpretentious.