Answer: indelible

AnswerCrossword Clue
INDELIBLEThat cannot be forgotten
INDELIBLEInk choice
INDELIBLEPermanent.
INDELIBLELike some pencils.
INDELIBLELike some ink
INDELIBLEUnerasable, as ink
indelible(of ink or a pen) Making marks that cannot be removed
indeliblethat cannot be eliminated, forgotten, or the like.
indelibleNot able to be forgotten or removed