When someone claims falsely, they are deliberately making false statements. Antonyms for this phrase would include being truthful, honest, or genuine. If one is telling the truth, they would be stating facts accurately and without any deceit. Similarly, if one is being honest, they would not twist the truth to make themselves look good or to deceive others. Lastly, if one is genuine, they are sincere in their words and actions, without any hidden agendas or ulterior motives. By using these antonyms, we can emphasize the importance of being truthful and honest in our dealings with others, in both our personal and professional lives.