inexpugnable
/ˌɪnɪkˈspʌɡnəbəl/
adjective
- Impossible to defeat, overcome, or capture; unconquerable.
- The general believed his position was inexpugnable, but the enemy found a way around.
- Her inexpugnable optimism helped the team through the worst of the crisis.
- The fortress was considered inexpugnable, with walls twenty feet thick.
Antonyms