General:
* Whispering: This is the most common and direct description.
* Murmuring: This implies a low, continuous sound, like a gentle stream.
* Rustling: This suggests a soft, brushing sound, almost like leaves moving in the wind.
* Hushing: This conveys a sense of quietness and secrecy.
More specific:
* Breathy: This describes a sound that is barely audible, almost like a sigh.
* Muffled: This implies that the sound is obscured, as if something is covering the mouth.
* Subdued: This suggests a quiet and restrained tone.
* Ethereal: This evokes a feeling of lightness and otherworldliness.
* Silken: This compares the sound to the soft texture of silk.
You can also use figurative language to describe the sound:
* A gentle breeze through a forest: This imagery evokes the soft rustling of leaves.
* The whisper of a secret: This suggests the hushed and confidential nature of the sound.
* A snowflake falling on a windowpane: This compares the sound to a delicate and fleeting moment.
Ultimately, the best word to use depends on the specific context and the effect you want to create.