indelible

Impossible to remove, erase, or wash away; permanent.

Making a mark not easily erased or washed away.

Unable to be forgotten; memorable.

Not deleble; not to be blotted out; incapable of being effaced or obliterated.

Not to be annulled.

That can not be removed, washed away, blotted out, or effaced; incapable of being canceled, lost, or forgotten

That can not be annulled; indestructible.

fast colors which do not fade or tarnish by exposure.

an ink not obliterated by washing; esp., a solution of silver nitrate.

having the quality of being difficult to remove, wash away, blot out, or efface;