unerasable

From un- + erase + -able.

unerasable (not comparable)

1. That cannot be erased; indelible.

   Synonym: indelible

   Antonyms: erasable, unrecordable

   • 2019, Chigozie Obioma, An Orchestra of Minorities, Abacus (2019), page 66:

     He hesitated at first to read it – as if he feared that what he would read on the screen would remain for eternity unerasable.