indelible
adj. C1 Advanced US //ˌɪnˈdɛɫɪbəɫ// UK //ɪndˈɛləbəl// in·deli·ble
adj. impossible to remove or forget. You use this to describe something that leaves a permanent mark, like a deep scar or a strong memory.
adj. impossible to remove or erase; lasting permanently. Often describes physical marks or deep-seated psychological impressions.
The ink on the document is indelible.
The experience of the war left an indelible mark on the entire generation.
The artist used a special pigment to ensure the signature remained indelible, even after decades of exposure to the elements.
From Latin indelebilis (“indestructible”).