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

• Ambrose Everett Burnside
• Ambrose Gwinett Bierce
• ambrosia
• Ambrosia artemisiifolia
• Ambrosia psilostachya
• Ambrosia trifida
• Ambrosiaceae
• ambrosial
• ambrosian
• ambulacral
• ambulacrum
• ambulance
• ambulance chaser
• ambulant
• ambulant plague
• ambulate
• ambulation
• ambulatory
• ambulatory plague
• ambuscade
• ambush
• ambusher
• Ambystoma
• Ambystoma maculatum
• Ambystoma mexicanum