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

• disk operating system
• disk overhead
• disk pack
• disk shape
• disk space
• disk-jockey
• disk-shaped
• diskette
• disklike
• dislikable
• dislike
• disliked
• dislocate
• dislocated
• dislocation
• dislodge
• dislodgement
• dislodgment
• dislogistic
• disloyal
• disloyally
• disloyalty
• dismal
• dismally
• dismantle