indelible \in-DEL-uh-buhl\ (adjective) - 1 : That cannot be removed, erased, or washed away. 2 : Making marks that cannot easily be removed or erased. 3 : Incapable of being forgotten; memorable.
"Wanting an indelible representation of their eternal love for each other, Jim had a tattoo of Jane's name placed on his arm."
Indelible is from Latin indelebilis, from in-, "not" + delebilis, "that can be obliterated or destroyed," from delere, "to blot out, to efface, to destroy."