The antonyms for the word "un-trustiest" are reliable, trustworthy, faithful, dependable, genuine, sincere, and honest. These terms describe people who can be counted on to keep their word, follow through on commitments, and act with integrity. These are individuals who have consistently demonstrated their trustworthiness over time and have earned the respect and confidence of others. While the opposite of "un-trustiest" may seem like a basic quality, it is an essential trait that is highly valued in personal and professional relationships. Having reliable and dependable people in our lives helps us feel secure and confident, allowing us to thrive personally and professionally.