Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
self-important is an adjective meaning "having or showing feelings of unwarranted importance out of overbearing pride". It carries one recorded sense.
Definitions, synonyms and semantic relations for self-important come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.