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