Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
inestimable is an adjective meaning "beyond calculation or measure". It carries one recorded sense.
beyond calculation or measure
“an incomputable amount”
“jewels of inestimable value”
“immeasurable wealth”
Definitions, synonyms and semantic relations for inestimable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.