Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
impertinently is an adverb meaning "in an impudent or impertinent manner". It carries one recorded sense.
in an impudent or impertinent manner
“a lean, swarthy fellow was peering through the window, grinning impudently”
Definitions, synonyms and semantic relations for impertinently come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.