When it comes to the phrase "unlikely winner," there are many synonyms that can be used to describe someone who was not expected to come out on top. Some of these words include underdog, dark horse, long shot, outsider, and surprise victor. These words all convey the idea of someone or something that is not favored to win but manages to do so anyway, often through determination, hard work, and a bit of luck. While it is always exciting to root for the underdog, it is important to remember that anyone can overcome the odds with enough effort and perseverance.