adjective
An adjective is a word that describes or modifies a noun or pronoun. In this case, 'abrupt' describes something that is sudden or unexpected.
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The meeting came to an abrupt end when the fire alarm went off.
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She left the party abruptly without saying goodbye to anyone.
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He ghosted her abruptly after their third date.
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The sudden change in weather was an abrupt reminder that winter was coming.