descriptive · dim, subtle, or indistinct, especially regarding light, sound, or fragrance

远处传来幽幽的笛声，在夜空中回荡。

descriptive · sad, sorrowful, or expressing deep internal gloom

她幽幽地叹了一口气，眼神中充满了哀伤。

descriptive · deep, quiet, and remote in terms of environment or atmosphere

穿过这片幽幽的小径，就能看到那座古庙。