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