inexpugnable

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

Learned borrowing from Latin inexpugnābilis. Morphologically, from in- + expugn + -able.

We have here, in short, the sphere of what Matthew Arnold likes to call Aberglaube, legitimate, inexpugnable, yet doomed to eternal variations and disputes. — The Will to Believe, and Other Essays in Popular Philosophy, William James
Others retreating with panic terror perished by leaping down the precipices; and thus the rock which had been inexpugnable to Heracles was occupied by Alexander. — The Anabasis of Alexander : $b or, The history of the wars and conquests of Alexander the Great, Arrian
Therefore the mind which is free from passions is a citadel, for man has nothing more secure to which he can fly for refuge and for the future be inexpugnable. — Thoughts of Marcus Aurelius Antoninus, Emperor of Rome Marcus Aurelius

impregnable

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