"gaieté de cœur" meaning in English

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  "etymology_text": "From French gaieté de cœur.",
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          "ref": "1751, [Tobias] Smollett, The Adventures of Peregrine Pickle […], volume (please specify |volume=I to IV), London: Harrison and Co., […], →OCLC:",
          "text": "Meanwhile, he […] attended me in all my excursions, and particularly in an expedition to Antwerp, with two other gentlemen, where in downright gaietè de cœur, we sat for our pictures, which were drawn in one piece […].",
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          "text": "Emily […] in youthful gaieté de cœur had got a little tired of her.",
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        "Lightheartedness; playfulness."
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  "word": "gaieté de cœur"
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