Something effervescent has bubbles or froth, like a sparkling cider or a bubble bath. If you have a happy, light, cheerful personality — if you are "bubbly" — you too are effervescent.

Coming from the Latin effervēscere, the original meaning was more boiling than bubbly, thanks to the ferv part, which means "hot." The word literally refers to bubbles giving off gas, and any drinks you enjoy that are nose-ticklingly effervescent make bubbles that pop and release into the air. Remember, someone with an effervescent personality is just bubbly, not full of gas!

Definitions of effervescent
  1. adjective
    (of a liquid) giving off bubbles
    bubbling, bubbly, effervescing, foaming, foamy, frothy, spumy
    emitting or filled with bubbles as from carbonation or fermentation
    aerated, charged
    supplied with carbon dioxide
    fizzing, fizzy
    hissing and bubbling
    having carbonation (especially artificially carbonated)
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    not effervescent
    having lost effervescence
    noncarbonated, uncarbonated
    not having carbonation
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  2. adjective
    used of wines and waters; charged naturally or artificially with carbon dioxide
    synonyms: sparkling
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    noneffervescent, still
    not sparkling
  3. adjective
    marked by high spirits or excitement
    “his fertile effervescent mind”
    synonyms: bubbling, frothy, scintillating, sparkly
    full of life and energy
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