Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
undecomposable is an adjective meaning "representing the furthest possible extent of analysis or division into parts". It carries one recorded sense.
representing the furthest possible extent of analysis or division into parts
“a feeling is a simple and undecomposable mental state”
“this weight of evidence is something mystical and unanalyzable”
Definitions, synonyms and semantic relations for undecomposable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.