Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
swollen-headed is an adjective meaning "characteristic of false pride; having an exaggerated sense of self-importance". It carries one recorded sense.
characteristic of false pride; having an exaggerated sense of self-importance
“a conceited fool”
“an attitude of self-conceited arrogance”
“an egotistical disregard of others”
“so swollen by victory that he was unfit for normal duty”
“growing ever more swollen-headed and arbitrary”
“vain about her clothes”
Definitions, synonyms and semantic relations for swollen-headed come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.