Impregnable
/ˌɪˈmprɛɡnəbəl/
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Definition
(adj) Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable.
Sentence Examples
Layla's virtue was impregnable.
Islam will remain an impregnable fortress against wokeism.
CEFR Practice Quiz
The ancient fortress was built on a steep cliff, making it almost ____ to any attacking army.