Antonyms of verb roughen

1 sense of roughen

Sense 1
roughen -- (make rough or rougher; "roughen the surfaces so they will stick to each other")
       Antonym of smooth (Sense 1)
      => smooth, smoothen -- (make smooth or smoother, as if by rubbing; "smooth the surface of the wood")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb roughen

1 sense of roughen

Sense 1
roughen -- (make rough or rougher; "roughen the surfaces so they will stick to each other")
       => change surface -- (undergo or cause to undergo a change in the surface)

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