[syn: silent, unsounded]
The Collaborative International Dictionary of English v.0.48:
Unsounded \Unsounded\
   See sounded.
WordNet (r) 3.0 (2006):
unsounded
    adj 1: situated at or extending to great depth; too deep to have
           been sounded or plumbed; "the profound depths of the
           sea"; "the dark unfathomed caves of ocean"-Thomas Gray;
           "unplumbed depths of the sea"; "remote and unsounded
           caverns" [syn: profound, unfathomed, unplumbed,
           unsounded]
    2: not made to sound; "the silent `h' at the beginning of
       `honor'"; "in French certain letters are often unsounded"
       [syn: silent, unsounded]