Wordnet 3.0
ADJECTIVE (1)
1. 
 characterized by soft sounds; 
- Example: "a murmurous brook"- Example: "a soughing wind in the pines"- Example: "a slow sad susurrous rustle like the wind fingering the pines"- R.P.Warren[syn: murmurous, rustling, soughing, susurrous]
WordNet (r) 3.0 (2006):
soughing
    adj 1: characterized by soft sounds; "a murmurous brook"; "a
           soughing wind in the pines"; "a slow sad susurrous rustle
           like the wind fingering the pines"- R.P.Warren [syn:
           murmurous, rustling, soughing, susurrous]