exuberant (adj) - full of positive energy, excitement, and joy; high spirited or effusive; growing lavishly or profusely [ig-zoo-ber-uhnt]
exuberance is an expression of vigorous or joyful enthusiasm or liveliness
BREAKDOWN: The figurative sense of an overflowing of positive energy derives from a more literal outpouring. The Latin word exuberantia meaning superabundance comes from the prefix EX- meaning thoroughly and the Latin uber (not to be confused with the German word or ride-hailing app) meaning udder. The implication is a profuse flow of something wonderful, be it milk or manic excitement
“I tend to think of action movies as exuberant morality plays in which good triumphs over evil.” —Sylvester Stallone

[Our Wednesday Wildcards are fascinating and important words that are not necessarily derived from classical roots.]