The word "sur-mounting" means to conquer or overcome a difficulty. Its antonyms include surrendering, giving up, succumbing, yielding, and failing. Surrendering means to give up, and this opposite action shows weakness and lack of effort. Yielding and succumbing also suggest defeat, as they indicate that an obstacle has been too high to overcome. Failing is another antonym, showing that one cannot achieve the desired outcome. Therefore, while sur-mounting brings a sense of accomplishment, these antonyms show the opposite, as they imply defeat and giving up.