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