The antonyms for the word "most undissembled" are "insincere," "deceitful," "false," "hypocritical," and "disingenuous." These words are used to describe someone who is not genuine or honest in their expressions or behavior. They may be pretending to feel or think a certain way, or they may be hiding their true intentions. These characteristics are often associated with negative qualities such as dishonesty, manipulation, and betrayal. In contrast, being undissembled refers to being genuine, sincere, and honest, which are considered positive traits. Therefore, it is important to avoid these antonyms and strive to be truthful and authentic in our interactions with others.