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

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• Publius Aelius Hadrianus
• Publius Cornelius Scipio
• Publius Cornelius Scipio Africanus Major
• Publius Cornelius Tacitus
• Publius Ovidius Naso
• Publius Terentius Afer
• Publius Vergilius Maro
• pubococcygeus exercises
• Puccini