Answer: SILKIEST

AnswerCrossword Clue
SILKIESTMost lustrous
SILKIESTMost smooth and lustrous
SILKIESTSmoothest.
silkiestOf or resembling silk, esp. in being soft, fine, and lustrous
silkiest(of a person or their speech or manner) Suave and smooth, esp. in a way intended to be persuasive
silkiestSILKY, resembling silk