Which word describes something with great depth or importance?

The term "profound" signifies something that has great depth or importance, whether in thought, emotion, or significance. When something is described as profound, it suggests that it goes beyond the surface level, offering deep insights or substantial weight in its meaning. For example, a profound idea in literature or philosophy can change one’s perspective or provoke deep contemplation, indicating that it is not merely superficial but carries significant implications or insights.

In contrast, the other words reflect lesser depth or importance. "Shallow" refers to something lacking depth, both physically and metaphorically. "Trivial" implies that something is of little value or importance, often relating to mundane or insignificant details. Similarly, "insignificant" denotes something that is unimportant or minor in the grand scheme of things. Therefore, "profound" is the word that appropriately conveys the sense of great depth or importance.