The word "un-loyal" means lacking loyalty or faithfulness. The antonyms of "un-loyal" would be "loyal," "faithful," "committed," "devoted," "dedicated," "true," "steadfast," "trustworthy," and "reliable." A loyal person is someone who remains steadfast in their allegiance to a particular person, a group or a cause. They are trustworthy and reliable and will always remain faithful to their commitments. Being loyal is highly admired in relationships and business as it demonstrates trustworthiness, commitment, and reliability. It creates a sense of security and trust which is essential to building strong and healthy relationships.