Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
fearlessly is an adverb meaning "without fear". It carries one recorded sense.
without fear
“fearlessly, he led the troops into combat”
Definitions, synonyms and semantic relations for fearlessly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.