The term "fourflushed" describes someone who is insincere or falsely boasts about their accomplishments or abilities. While there are no true antonyms for this word, there are several words that describe the opposite behavior. For example, the word "humble" implies someone who is modest and not prone to bragging. "Honest" suggests someone who is open and truthful about their abilities and accomplishments, while "sincere" implies that someone is genuine in their demeanor and not putting on a false front. Other antonyms could include "authentic," "genuine," or "humblebrag-less," all of which describe the opposite of someone who is fourflushed.