From The Collaborative International Dictionary of English v.0.48 :
Unsounded \Unsounded\
See sounded.
From 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]