資料來源 : pyDict

柔滑,平滑,平坦

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Smoothness \Smooth"ness\, n.
   Quality or state of being smooth.

資料來源 : WordNet®

smoothness
     n 1: a texture without roughness; smooth to the touch [ant: {roughness}]
     2: the quality of being free from errors or interruptions