The most likely meaning of the word insurmountable is unbeatable.
The conceptual meaning of a word refers to the meaning universally agreed by the speakers of a language about a word. For example, the word giraffe refers to a specific animal.
The word insurmountable is an adjective used to describe something as:
For example:
Based on this, the word that best describes insurmountable is unbeatable.
Note: This question is incomplete because the paragraph is not given. Due to this, I answered it based on general knowledge.
Learn more about adjectives in: https://brainly.com/question/11385993