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

• wicked
• wickedly
• wickedness
• wicker
• wicker basket
• wickerwork
• wicket
• wicket door
• wicket gate
• wicket-keeper
• wicking
• wickiup
• Wickliffe
• Wicklow
• wickup
• Wiclif
• wicopy
• Widal test
• Widal's test
• widdershins
• widdle
• wide
• wide area network
• wide boy
• wide of the mark