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