adjective
a descriptive word that modifies or describes a noun or pronoun, in this case, 'unsmooth' describes something that is not smooth
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The surface of the table was unsmooth and needed to be sanded down.
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The road was so unsmooth that we had to drive slowly to avoid any damage to the car.
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I can't believe how unsmooth that guy was trying to flirt with you.
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The negotiation process hit an unsmooth patch when both parties couldn't agree on the terms.