Four flusher is a term used to describe someone who pretends to be something they're not, especially in a game or a sport. Antonyms for four flusher could include honest, genuine, authentic, legitimate, truthful, and sincere. Someone who is honest will always tell the truth and never deceive others to gain an unfair advantage. A genuine person is real and acts without pretense. Authentic and legitimate people are always true to themselves and their values. Truthful people never lie or exaggerate to deceive others. Finally, those who are sincere show their true selves without any artificiality or deception. Overall, compared to a four flusher, all these antonyms embody qualities of honesty, integrity, and authenticity.