Which of the following best describes something that is impressively powerful or intense?

The term that best describes something impressively powerful or intense is "formidable." This word carries connotations of strength, capability, and the ability to inspire awe or respect due to its impressive qualities. For example, a formidable opponent in a competition can be one that is exceptionally skilled and presents a significant challenge to others, thereby capturing the idea of intensity and power.

In contrast, terms such as "trivial," "weak," and "inconsequential" convey notions of insignificance or lack of strength. "Trivial" refers to something of little value or importance, while "weak" implies a lack of strength or effectiveness. "Inconsequential" denotes something that does not matter or lacks importance. None of these terms align with the idea of being powerful or intense, making "formidable" the most fitting choice.