as in lightness
a lack of seriousness often at an improper time
try to restrain your natural frothiness at least for the duration of the lecture
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as in goofy
lacking in seriousness or maturity
a frothy comedy that wouldn't exert the brain of a gnat
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as in insubstantial
being of a material lacking in sturdiness or substance
the sort of frothy costumes worn by Las Vegas showgirls
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Merriam-Webster unabridged
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