Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unexcelled is an adjective meaning "not capable of being improved on". It carries one recorded sense.
not capable of being improved on
Definitions, synonyms and semantic relations for unexcelled come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.