Which word describes an enthusiastic and unrestrained mindset?

The word "exuberant" perfectly encapsulates an enthusiastic and unrestrained mindset. It conveys a sense of high energy, lively spirit, and joyous enthusiasm that can be expressed in various contexts—be it through behavior, attitude, or emotion. When someone is described as exuberant, it implies that they are overflowing with excitement and positivity, often exhibiting a carefree and spirited nature that is infectious to those around them. This quality reflects an absence of restraint, allowing an individual to express themselves fully and passionately.

In contrast, the other options present different meanings that do not align with the description of an enthusiastic mindset. Compassion relates to empathy and concern for others, which does not inherently indicate enthusiasm. Applicable pertains to relevance or suitability, rather than emotional expression. Decorum refers to appropriate behavior or conduct in social situations, emphasizing restraint and conformity rather than unrestrained enthusiasm.