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

See also: silent

• acetanilid
• acetanilide
• acetate
• acetate disk
• acetate rayon
• acetic
• acetic acid
• acetic anhydride
• acetify
• acetin
• aceto-
• acetoacetic acid
• acetone
• acetone body
• acetonemia
• acetonic
• acetonuria
• acetophenetidin
• acetose
• acetous
• acetphenetidin
• acetum
• acetyl
• acetyl chloride
• acetyl group