unerasable
1. [ adjective ] cannot be removed, washed away or erased
Synonyms: indelible
Examples:

"an indelible stain"

Related terms: ineradicable
Similar spelling:   unreachable
  unreasonable
  unarguable
  unreasonably
  unresolvable
  unworkable
  unrusted
  unrecoverable
  unrestrained
  unarguably