indelible:
- that cannot be removed, erased, or washed away
- making marks that cannot easily be removed or erased
- incapable of being forgotten; memorable
(
Example: In a sense, these years were like a blur of hunger, a time without roots or a sense of stability that made an indelible mark and colored his every move years later. [
Reference: Marcos Bretón and José Luis Villegas, Away Games])