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Impossible to efface; indelible.

in′ef·face′a·bil′i·ty n.
in′ef·face′a·bly adv.
References in classic literature ?
It was the fatal flaw of humanity which Nature, in one shape or another, stamps ineffaceably on all her productions, either to imply that they are temporary and finite, or that their perfection must be wrought by toil and pain.
The person who launched it on its new career was that remarkable man who, without learning, with few virtues, and with no strength of character, has nevertheless stamped himself ineffaceably on history by the force of a vivid imagination, and by the help of a genuine and burning love for his fellow-men, for which much will always have to be forgiven him.
Her personal appearance and bearing are ineffaceably stamped upon my memory.