The antonyms for "un manlier" include "manlier," "more masculine," "more macho," "braver," and "more courageous." These words describe qualities associated with traditional male characteristics, such as strength, assertiveness, and bravery. Using antonyms like these can be helpful in expressing the opposite of "un manlier," which implies a lack of these qualities. By using antonyms like "manlier," you can convey the opposite message and assert the presence of the qualities associated with masculinity. It is important to note, however, that these words also carry cultural baggage and can perpetuate gender stereotypes. Therefore, it is essential to use them thoughtfully and appropriately.