adjective
adjective describes a quality or attribute of a noun, in this case, 'tacky' describes something that is in poor taste or low quality.
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The design of the new building was deemed tacky by the architectural critics.
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I think that outfit looks a bit tacky, don't you?
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That movie was so tacky, I couldn't even finish watching it.
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His behavior at the party was so tacky, it was embarrassing to watch.