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