Skip to content
GREMockTests
GRE vocabulary

impregnable

adjectiveHigh-frequency wordMore I words

unable to be captured, overcome, or broken through; completely secure

Word origin: From Old French imprenable, not able to be taken, from prendre, to take.

Start a free GRE mock test 39 minutes · free · instant score
In a sentence

Impregnable in a sentence

Here are example sentences showing impregnable in a sentence.

The mountain fortress was considered impregnable by its defenders.

The medieval citadel was considered impregnable because its position atop sheer cliffs denied attackers any approach.

Synonyms
Antonyms
vulnerabledefenselessweak

Quick GRE check

Question 1 of 3

3 questions, about 2 minutes. How would you do on the real test?

Verbal · Text Completion

Critics initially dismissed the composer's late works as merely blank, but later scholars recognized in them a deliberate restraint that concealed considerable technical sophistication.

Select the word that best completes the sentence.

Usage & nuance

Using “impregnable” well

Impregnable describes a defense so strong it cannot be breached, and it extends figuratively to arguments or reputations that resist all challenge.

Common questions

Questions about “impregnable”

Impregnable (adjective) means unable to be captured, overcome, or broken through; completely secure
Here is impregnable used in an example sentence: "The mountain fortress was considered impregnable by its defenders." Another example: "The medieval citadel was considered impregnable because its position atop sheer cliffs denied attackers any approach."
Common synonyms for impregnable include invincible, inviolable, unassailable.
Antonyms of impregnable include vulnerable, defenseless, weak.
Pair impregnable with invincible, inviolable, and unassailable in Sentence Equivalence. Its antonyms vulnerable, defenseless, and weak frequently signal the intended contrast.
Yes. Impregnable is a high-frequency GRE word, so it is worth prioritising as you build your vocabulary.

See these words the way the GRE tests them.

Take the free 39-minute GRE Quick Mock Test and meet words like this inside real Text Completion and Sentence Equivalence questions, with a worked solution for every answer.