Putting false front refers to pretending or acting falsely to appear something that you are not. The antonyms for the term would be genuine, authentic, honest, and sincere. These antonyms are the opposite of the deceptive behavior implied by putting a false front. Genuine refers to being real, true, and honest, whereas authentic means something that is original or trustworthy. Honest refers to a person or behavior that is truthful and straightforward, while sincere is a characteristic of a person who is genuine and truthful in their beliefs and emotions. Using these antonyms can convey the idea of truthfulness, transparency, and authenticity.