The word "sur-mounts" refers to overcoming a challenge or obstacle. Some antonyms for this word would be surrender, yield, or give up. These words imply a sense of defeat or resignation rather than triumph. Other antonyms could include failing, falling short, or being unable to overcome the obstacle. While these words may seem negative, they also serve as a reminder that not every obstacle can be overcome and that it is important to accept our limitations and learn from our failures. Using the right antonym can help to convey a different tone or emotion in a particular context, highlighting the complexity and nuance of language.