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