Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
uninstructed is an adjective meaning "lacking information or instruction". It carries one recorded sense.
lacking information or instruction
“lamentably unenlightened as to the laws”
Definitions, synonyms and semantic relations for uninstructed come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.