The word "conniving" suggests sneaky or deceptive behavior, so antonyms for "more conniving" would include words such as honest, forthright, transparent, trustworthy, and reliable. In contrast to being conniving, these antonyms suggest a person who is open and sincere in their dealings with others. Additionally, antonyms for "more conniving" may include words such as ethical, principled, honorable, sincere, and kind-hearted. These terms illustrate individuals who operate with strong moral values and are focused on doing what is right, rather than manipulating situations for their own benefit.