adjective
adjective is a word that describes or modifies a noun or pronoun. In this case, 'greasy' describes something that is covered in or producing grease.
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The mechanic's hands were covered in greasy oil after working on the car.
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I hate it when my hair gets greasy after not washing it for a few days.
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I can't stand how greasy that pizza place makes their slices.
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The politician's greasy smile made me question his sincerity.