Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ununderstood is an adjective meaning "not understood". It carries one recorded sense.
not understood
“should not tamely submit to the unpredictable and ununderstood cycles of wars”
Definitions, synonyms and semantic relations for ununderstood come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.