Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
undistinguishable is an adjective meaning "not capable of being distinguished or differentiated". It carries one recorded sense.
not capable of being distinguished or differentiated
“the two specimens are actually different from each other but the differences are almost indistinguishable”
“the twins were indistinguishable”
“a colorless person quite indistinguishable from the colorless mass of humanity”
Definitions, synonyms and semantic relations for undistinguishable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.