Synonyms for Polysyllabic (same or very similar meaning)
WordNet sense 1 (consisting of a syllable or syllables):
syllabicWordNet sense 2 ((of words) long and ponderous; having many syllables):
sesquipedalianWordNet sense 3 (primarily spatial sense; of relatively great or greater than average spatial extension or extension as specified):
longFrom the ODE community, based on WordNetadd/edit