inexpungable

In reality, it lasted perhaps five seconds; at the end of that time, the Tacoma Narrows Bridge had earned an inexpungable place in the history of engineering.

The Fountains of Paradise Clarke, Arthur C. 1979

Yet the thought of it is and remains inexpungable from our minds.

Ethics 384 BC-322 BC Aristotle

Of such scepticism mathematics is a perpetual reproof; for its edifice of truths stands unshakable and inexpungable to all the weapons of doubting cynicism.

Mysticism and Logic and Other Essays Bertrand Russell 1921

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Mysticism and Logic and Other Essays Bertrand Russell 1921

Sovereignty is an inexpungable and inherent privilege; government is a secondary and artificial privilege.

The Battle of Principles A Study of the Heroism and Eloquence of the Anti-Slavery Conflict Newell Dwight Hillis 1893