Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
undutiful is an adjective meaning "lacking due respect or dutifulness". It carries one recorded sense.
lacking due respect or dutifulness
“impious toward one's parents”
“an undutiful son”
Definitions, synonyms and semantic relations for undutiful come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.