She ran her fingers over the silk, feeling its sensuously smooth texture.

sensuously 是形容词 sensuous 的副词形式，sensuous 来自名词 sense（感觉、感官），加上形容词后缀 -uous，表示"通过感官感受的、给人美感的"。sensuously 在这里描述触摸丝绸时那种细腻愉悦的触感体验。