Fourflush is a term that originates from poker, where it means to pretend to have a stronger hand than one actually has. The antonyms for this term include honesty, integrity, and frankness. In contrast to a fourflusher, an honest person would not pretend to have more than they do and would play the game fairly. Similarly, a person with integrity would stick to their honest principles and not compromise them for personal gain. Lastly, a frank person would be straightforward and truthful about their hand, not trying to deceive or mislead others. These antonyms highlight the importance of ethical behavior and honesty in both poker and life in general.