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