gleeful

This term describes a high-energy state of joy that often carries a hint of self-satisfaction or playfulness. It differs from simple happiness by suggesting an outward, visible expression of delight, frequently linked to a sense of victory or the successful execution of a prank.

Because of its association with mischief, the word can occasionally lean toward a negative or sinister connotation, such as the delight a villain feels when a plan succeeds. It is more intense and specific than "cheerful," implying a momentary peak of excitement rather than a general disposition.