1. Marked by absence of sound
   "soundless footsteps on the grass"
   - silent, still

See also: quiet, soundlessly, soundlessness

• costless
• costliness
• costly
• costmary
• costoaxillary vein
• costochondritis
• costs
• costume
• costume designer
• costumed
• costumer
• costumier
• costus oil
• costusroot
• cosy
• cot
• cot death
• Cotacachi
• cotan
• cotangent
• cote
• Cote d'Azur
• Cote d'Ivoire
• Cote d'Ivoire franc
• cotenant