1. Without speaking
   - mutely, wordlessly, taciturnly 
2. Without a sound
   - noiselessly, soundlessly

See also: silent

• bona fides
• Bonaire
• bonanza
• Bonaparte
• Bonar Law
• Bonasa
• Bonasa umbellus
• bonavist
• bonbon
• bonce
• bond
• bond certificate
• bond issue
• bond paper
• bond rating
• bond servant
• bond trading
• bond-trading activity
• bondable
• bondage
• bonded labor
• bonded labour
• bonder
• bonderise
• bonderize