The antonym for the word "un-sung" is "famous" or "celebrated." When someone or something is un-sung, it means that they have not received any recognition or praise for their accomplishments. In contrast, when a person or object is famous, it means that they are well-known and respected for their talents or achievements. For example, many artists and musicians remain un-sung during their lifetimes, but their works may become famous after their deaths. Similarly, a product or brand may start off un-sung, but with effective marketing and advertising, it can become a celebrated name in its industry.