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