Which word refers to vigorous and enthusiastic enjoyment?

The term that signifies vigorous and enthusiastic enjoyment is "gusto." This word is often used to describe a lively or hearty enjoyment, especially in relation to activities such as eating, drinking, or participating in events. It conveys a sense of energy and passion, suggesting that someone is fully immersed in the experience and savoring it to the fullest.

In contrast, "cunning" refers to being sly or clever, often with a negative connotation of deceit. "Momentum" relates to the movement or force gained by a moving object and does not denote enjoyment at all. "Scarcity" means the state of being in short supply, which is unrelated to the concept of enjoyment. By understanding the context and nuance of "gusto," one can appreciate its vibrant connotation, making it the correct choice.