Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
indeterminably is an adverb meaning "in an indeterminable manner". It carries one recorded sense.
in an indeterminable manner
“their relationship was of an indeterminably vague nature”
Definitions, synonyms and semantic relations for indeterminably come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.