unsounded

/ˈʌnˌsaʊndəd/

Definitions of unsounded

1. adjective

   not made to sound
   “in French certain letters are often unsounded”

   synonyms: silent

   inaudible, unhearable

   impossible to hear; imperceptible by the ear
2. adjective

   situated at or extending to great depth; too deep to have been sounded or plumbed
   “remote and unsounded caverns”

   synonyms: profound, unfathomed, unplumbed

   deep

   having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination