The antonyms for "most defecting" are "least disloyal" or "most loyal." These words convey the opposite meaning of defecting, which means to abandon allegiance or support. So, if someone is not defecting, they are staying true to their commitments, remaining faithful and loyal to their cause, organization, or country. This quality is highly desirable in people, and it instills trust and confidence in others. Being loyal means that one is dependable, trustworthy, and dedicated to a cause, which is a desirable trait in any individual. Therefore, instead of focusing on those who defect, let's focus on those who remain loyal, dedicated, and steadfast in their convictions.