Which adjective implies a sense of grandeur and importance?

The adjective "stately" implies a sense of grandeur and importance due to its connotation of majesty and dignity. When something is described as stately, it evokes imagery of elevated status and impressive presence, often associated with formal elegance. This word is typically used to characterize things like architecture, gardens, ceremonies, or individuals that carry an air of nobility and sophistication.

In contrast, the other choices do not carry the same sense of importance or grandeur. "Supple" refers to flexibility and pliability, "rampant" often describes something that is unchecked or growing wildly, and "ominous" conveys a sense of foreboding or menace rather than grandeur. Thus, "stately" stands out as the most fitting choice for describing something that embodies a sense of grandeur and importance.