impregnable
adjective/ɪmˈprɛɡnəbəl/
Frequency rank: #18,040 most common English word
Meaning
Unable to be captured, broken into, or overcome; completely secure against attack.
Example sentence
The ancient castle was considered impregnable because its walls had never been breached in centuries of warfare.
Synonyms & related words
- invincible
- unconquerable
- invulnerable
- unassailable
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