Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unlettered is an adjective meaning "having little acquaintance with writing". It carries 2 recorded senses.
having little acquaintance with writing
“special tutorials to assist the unlettered sector of society”
Definitions, synonyms and semantic relations for unlettered come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.