permanent,
lasting continuing or enduring without marked change in status or condition or place; "permanent secretary to the president"; "permanent address"; "literature of permanent value"
indelible,
unerasable cannot be removed or erased; "an indelible stain"; "indelible memories"
inexpungeable,
inexpungible not capable of being expunged; "the inexpungible scent of a bottle of perfume he had broken"- Louis Auchincloss
