1. Situated at or extending to great depth; too deep to have been sounded or plumbed
   "remote and unsounded caverns"
   - profound, unfathomed, unplumbed 
2. Not made to sound
   "in French certain letters are often unsounded"
   - silent

See also: deep, inaudible, unhearable

• shading
• shadoof
• shadow
• shadow cabinet
• shadow play
• shadow show
• shadowbox
• shadowboxing
• shadowed
• shadower
• shadowgraph
• shadowiness
• shadowing
• shadowless
• shadowy
• shaduf
• shady
• shaft
• shaft louse
• shaft of light
• shag
• shag rug
• shagbark
• shagbark hickory
• shagged