Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unvanquishable is an adjective meaning "incapable of being overcome or subdued". It carries one recorded sense.
incapable of being overcome or subdued
“an invincible army”
“her invincible spirit”
Definitions, synonyms and semantic relations for unvanquishable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.