adjective
adjective describes a noun or pronoun, in this case 'seedy' describes something that is run-down, disreputable, or in poor condition
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The detective decided to investigate the seedy underbelly of the city.
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I heard that the seedy bar down the street got shut down last night.
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That guy gives me a seedy vibe, I don't trust him.
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The seedy thoughts in his mind were starting to take over.