Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ne'er-do-well is a noun meaning "an idle worthless person". It carries one recorded sense.
an idle worthless person
Definitions, synonyms and semantic relations for ne'er-do-well come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.