Having an even surface, or a surface so even that no roughness or points can be perceived by the touch; not rough; as, smooth glass; smooth porcelain.(adjective)
source: webster1913
noun (n)
the act of smoothing(noun.act)
Example: He gave his hair a quick smooth.
source: wordnet30
The act of making smooth; a stroke which smooths.(noun)
source: webster1913
adverb (r)
Smoothly.(adverb)
source: webster1913
adjective satellite (s)
smoothly agreeable and courteous with a degree of sophistication(adj.all)
Example: The manager pacified the customer with a smooth apology for the error.