Confidence artists are individuals who trick or deceive others through persuasion or manipulation. To describe someone who is not a confidence artist, we can use antonyms such as honest, trustworthy, sincere, or straightforward. Such individuals are straightforward in their dealings with others, they are not manipulative or devious in any way, and they act with the best intentions. They can also be described as credible, genuine, reliable, and faithful. These antonyms reflect a sense of integrity and uprightness, qualities that are opposite to the characteristics displayed by confidence artists. Hence, individuals who do not indulge in deceitful behavior can be described using these antonyms.