The word "prevails" means to be victorious or dominant in a particular situation. Its antonyms would be words that signify losing, being defeated, or being unsuccessful. Some of the antonyms for "prevails" include loses, fails, surrenders, succumbs, relinquishes, and yields. These words represent situations in which one does not emerge as the winner or is unable to overcome opposition. In contrast, "prevails" means that one has triumphed over adversaries, obstacles, or challenges. Antonyms are useful in providing contrast and highlighting the opposing aspects of a word, which helps to understand its meaning better.