Final answer:
Insurmountable is defined as something that cannot be overcome. It represents challenges that are extremely difficult to conquer.
Explanation:
Insurmountable means incapable of being overcome. To put it simply, it refers to obstacles that are too difficult to conquer or surpass.
In a sentence: The challenges he faced seemed insurmountable, but with determination and perseverance, he was able to overcome them.
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