Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
impetuously is an adverb meaning "in an impulsive or impetuous way; without taking cautions". It carries one recorded sense.
in an impulsive or impetuous way; without taking cautions
“he often acts impulsively and later regrets it”
Definitions, synonyms and semantic relations for impetuously come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.