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

See also: silent

• drinking song
• drinking straw
• drinking vessel
• drinking water
• drip
• drip coffee
• drip culture
• drip feed
• drip loop
• drip mat
• drip mold
• drip mould
• drip pan
• drip pot
• drip-dry
• dripless
• drippage
• drippily
• drippiness
• dripping
• dripping pan
• drippings
• drippy
• dripstone
• drivable