Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unseaworthy is an adjective meaning "unfit for a voyage". It carries one recorded sense.
unfit for a voyage
Definitions, synonyms and semantic relations for unseaworthy come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.