Which word signifies something of great significance or intensity?

The term "profound" signifies something that is of great significance or intensity, often delving deep into emotional or intellectual realms. It describes experiences, insights, or feelings that carry a weight or depth that profoundly impacts understanding or perception. For instance, a profound idea might change someone's perspective entirely, or a profound experience—such as loss or love—can lead to significant personal growth. This depth and intensity are what differentiate "profound" from terms like "substantial," which refers to size or amount rather than emotional or intellectual weight, or "trivial," which denotes something of little importance. The word "minor" clearly indicates lesser significance, making "profound" the best choice for expressing the idea of great significance or intensity.