adverb
An adverb is a word that modifies or describes a verb, adjective, or another adverb. In this case, 'suddenly' describes how an action is performed or how something happens.
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The stock market suddenly plummeted, causing widespread panic among investors.
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I was just walking down the street when suddenly it started pouring rain.
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I was chilling at home and suddenly my ex texted me out of the blue.
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As she walked through the forest, the realization of her own mortality suddenly hit her like a ton of bricks.