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

• conceptive
• conceptual
• conceptual semantics
• conceptualisation
• conceptualise
• conceptualism
• conceptualist
• conceptualistic
• conceptuality
• conceptualization
• conceptualize
• conceptually
• conceptus
• concern
• concerned
• concernedly
• concerning
• concert
• concert band
• concert dance
• concert grand
• concert hall
• concert piano
• concert pitch
• concert-goer