whisper

verb (used without object)

1. to speak with soft, hushed sounds, using the breath, lips, etc., but with no vibration of the vocal cords.
2. Phonetics. to produce utterance substituting breath for phonation.
3. to talk softly and privately (often implying gossip, slander, plotting, or the like): The king knew that the courtiers were whispering.
4. (of trees, water, breezes, etc.) to make a soft, rustling sound like that of whispering.