In a bubbly, lively, or enthusiastic manner; with the quality of fizzing or bubbling.
From effervescent (adjective) + -ly (adverb-forming suffix). Effervescent comes from Latin effervescere. The -ly suffix was already productive in Old English for forming adverbs from adjectives.
When you say someone 'spoke effervescently,' you're using a chemistry word to describe their personality—it's a perfect example of how scientific language becomes poetic when we describe human behavior!
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