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