Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unsounded is an adjective meaning "situated at or extending to great depth; too deep to have been sounded or plumbed". It carries 2 recorded senses.
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”
“unplumbed depths of the sea”
“remote and unsounded caverns”
Definitions, synonyms and semantic relations for unsounded come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.