Here are the matches for each underlined word and their more positively connoted counterparts:
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Cacophony - Symphony: "The malfunctioning car engine let out a symphony of sounds before it completely broke down."
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Dread - Curiosity: "When I heard a strange howl coming from the backyard, I peeked out the window with a sense of curiosity."
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Bold - Vibrant: "Their living room décor was done in rich, vibrant colors."
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Crestfallen - Sorrowful: "With the loss of his partner of 30 years, he was completely sorrowful."
Feel free to let me know if you need help with anything else!