Definition

Something that cannot be attacked or entered easily; very strong and secure.

Example

The castle was built to be impregnable against any enemy attack.

Conversation

Did you hear about that old castle on the hill?

Yeah, they say it's impregnable and no one has ever conquered it.

That sounds fascinating! I wonder what makes it so strong.

Probably the thick walls and strategic location; it seems impossible to attack.

Synonyms & Antonyms

Root Explanation

Impregnable is formed from "in-" (meaning not) and "prægnare" (from Latin, meaning to seize or take). The word describes something that cannot be taken or seized, hence, it refers to a fortress or place that cannot be captured or breached.

Memory Tip

Think of something that cannot be 'taken' ('prægnare') — 'in-' means not, so 'impregnable' means not able to be taken.

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