verb
to become more relaxed, easygoing, or genial
adjective
having a soft, rich, and pleasant flavor or character
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The mellow music played softly in the background during the elegant dinner party.
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Let's just have a mellow evening watching movies and relaxing at home.
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I love the mellow vibes at this chill coffee shop.
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After a long day, I finally felt my mind mellow out like a calm ocean at sunset.