Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
insuperable is an adjective meaning "impossible to surmount". It carries 2 recorded senses.
impossible to surmount
incapable of being surmounted or excelled
“insuperable odds”
“insuperable heroes”
Definitions, synonyms and semantic relations for insuperable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.