frothy

Something frothy is composed of many small air bubbles. You might like your cappuccino frothy but probably not your tap water.

If you order a cappuccino at a cafe, you'll get a cup of strong coffee topped with frothy milk, and a cake recipe might instruct you to beat four eggs until they're frothy. In both examples, air bubbles cause a liquid to become foamy and creamy. A frothy person, however, is bubbly in a different way, full of life and excitement. There's often an implication of "insubstantial," or even "silly" when a person or idea is described as frothy.

Definitions of frothy
  1. adjective
    emitting or filled with bubbles as from carbonation or fermentation
    synonyms: bubbling, bubbly, effervescing, foaming, foamy, spumy
    effervescent
    (of a liquid) giving off bubbles
  2. adjective
    marked by high spirits or excitement
    synonyms: bubbling, effervescent, scintillating, sparkly
    lively
    full of life and energy
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