That cannot be deleted, blotted out, or effaced; ineffaceable, permanent. of a stain on character or reputation, infamy, disgrace, etc.

(un-, prefix1 affix 1b.)

That cannot be extirpated or entirely rooted out.

That cannot be effaced, obliterated, or blotted out; indelible. (literal and figurative.)

That cannot be erased, expunged, or effaced.

(un-, prefix1 affix 1.)

Incapable of being eradicated or rooted out. Also figurative.

(un-, prefix1 affix 1b.)

(un-, prefix1 affix 1b.)

That cannot be expunged or obliterated; indelible.