Most up-front is a phrase that describes someone who is honest, direct, and straightforward. However, there are antonyms for this phrase that describe someone who is more reserved, ambiguous or indirect. Some examples of antonyms for most up-front include secretive, evasive, ambiguous, and devious. These individuals may use unclear or indirect language to conceal their true thoughts or intentions. While being most up-front is seen as a desirable trait in many situations, these antonyms highlight the importance of being aware of others' communication styles and adapting accordingly.