Sighing is a sound made by exhaling audibly, usually in response to an emotion such as sadness or frustration. MURMURING, with nine letters, is a similar sound but quieter and more subdued than sighing. WHISPERING, with ten letters, is even quieter and is often used to convey secrets or confidential information. RUSTLING, with eight letters, is a sound made by moving or stirring something, such as leaves or paper. All of these sounds are related to sighing in that they are all quiet, audible exhalations.