whispering

Adjective

• making a low continuous indistinct sound
  • like murmuring waves
    
  • susurrant voices
    

Noun

• speaking softly without vibration of the vocal cords

• a light noise, like the noise of silk clothing or leaves blowing in the wind

Related words

• Synonyms: 
  murmuring , susurrant , whisper , susurration , voicelessness , rustle , rustling