"Most oddson" is typically used to describe the most likely outcome or the favorite in a given situation. However, there are several antonyms that can be used instead. These include "least likely," "underdog," "long shot," "dark horse," and "outsider." These words are commonly used in sports, politics, and other areas where there is a clear favorite and an underdog. For example, in a political race, the incumbent may be considered the most oddson to win, while a newcomer without much experience could be seen as a dark horse candidate. Using antonyms can add nuance and complexity to your language and help you better describe the situation at hand.