ebullience

This term describes a high-spirited, bubbling energy that feels spontaneous and infectious. It carries a strong positive connotation, suggesting a joy that cannot be contained, similar to the physical action of boiling over. While exuberance is a close synonym, ebullience specifically evokes a sense of lightness and radiance.

As an uncountable noun, this word refers to an abstract quality of personality or mood. It cannot be pluralized or counted as individual units; instead, it is measured in degrees or described using adjectives like "natural" or "unbridled."