smoothness in WordNet English dictionary

1. the quality of being bland and gracious or ingratiating in manner
   suavity  suaveness  blandness  smoothness 
   
2. powerful and effective language
   "his eloquence attracted a large congregation"; "fluency in spoken and written English is essential"; "his oily smoothness concealed his guilt from the police"
   eloquence  fluency  smoothness 
   
3. a texture without roughness; smooth to the touch
   "admiring the slim smoothness of her thighs"; "some artists prefer the smoothness of a board"
   smoothness 
   
4. the quality of having a level and even surface
   "the water was a glassy smoothness"; "the weather system of the Pacific is determined by the uninterrupted smoothness of the ocean"
   smoothness 
   
5. the quality of being free from errors or interruptions
   "the five-speed manual gearbox is smoothness personified"
   smoothness