Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unerasable is an adjective meaning "cannot be removed or erased". It carries one recorded sense.
cannot be removed or erased
“an indelible stain”
“indelible memories”
Definitions, synonyms and semantic relations for unerasable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.