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