Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unacquainted is an adjective meaning "not knowledgeable about something specified". It carries 2 recorded senses.
not knowledgeable about something specified
“American tourists wholly innocent of French”
“a person unacquainted with our customs”
having little or no knowledge of
“unacquainted with city ways”
Definitions, synonyms and semantic relations for unacquainted come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.