effervescent \ef-er-VES-uhnt\,
adjective:
1. High-spirited; vivacious; lively.
2. Effervescing; bubbling.
One of them was a thickset young man who played doggedly without speaking, the other was an effervescent young man with white eyebrows and a nervous manner.
-- James Joyce, "Stephen Hero"
Bobbing up and down, for a few seconds, like an apple in a bowl of toddy, he, at length, finally disappeared amid the whirlpool of foam which, in the already effervescent liquor, his struggles easily succeeded in creating.
-- Edgar Allan Poe, "King Pest"
That night, when Jennifer and I go out to dinner, she is effervescent with plans for our future.
-- Isaac Asimov, "Science Fiction Magazine, Volume 8, 1984"
Effervescent originated as a French verb in the 1650s meaning, 'the action of boiling up' (as in water), though it did not assume its figurative meaning relating to personality until 1748.
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