smoothness (part of speech: noun)
- His peculiarities included a faculty for breaking his bones, at frequent and inconvenient occasions, an insatiable curiosity about matters with which he had no concern, and a most engaging and delusive silkiness of manner. - "A College Girl", Mrs. George de Horne Vaizey.
- He was a dapper little man, with a fiery, clean- shaven face, and a fringe of grizzled hair above his ears that gave the lie to the auburn silkiness with which his head was crowned. - "Malcolm Sage, Detective", Herbert George Jenkins.
- " Now"- Evarin's voice, hard with the silkiness of a cat's snarl, clawed the silence-" we'll talk business." - "The Door Through Space", Marion Zimmer Bradley.