adj.坚不可摧的，牢不可破的，不可战胜的，难以改变的

The ancient castle stood tall and impregnable, a testament to the engineering skills of its builders.
古老的城堡高高耸立，坚不可摧，见证了建造者的卓越工程技艺。
The cyber security system they developed proved to be completely impregnable, fending off even the most sophisticated hacking attempts.
他们开发的网络安全系统被证明是无懈可击的，就连最复杂的黑客攻击也未能侵入。
The team's defense was so impregnable that the opposing team failed to score a single goal throughout the match.
这支球队的防守坚如磐石，对手在整个比赛中一球未进。
The encrypted code was impregnable, leaving the hackers frustrated in their attempts to decipher it.
加密代码牢不可破，让试图破解的黑客感到沮丧。
The mountain fortress, surrounded by sheer cliffs on all sides, seemed an impregnable stronghold.
那座被四面绝壁环绕的山中堡垒，看起来固若金汤。
Her arguments in the debate were impregnable, with every point logically sound and well-supported.
她在辩论中的论点无懈可击，每一点都逻辑严密且有充分的证据支持。
The city's walls, built centuries ago, remained impregnable against modern weaponry, preserving its historical integrity.
这座城市几百年前建造的城墙，即便面对现代武器也依然坚不可摧，保护了其历史完整性。
The company's reputation for quality is impregnable, a result of decades of consistent excellence.
公司的质量声誉无可挑剔，这是几十年来始终如一的卓越成果。
The encryption algorithm used by the military is considered virtually impregnable, ensuring secure communication channels.
军方使用的加密算法被认为几乎是无法破解的，确保了通信渠道的安全。
Despite numerous attacks, her belief in justice remained impregnable, a beacon of hope for many.
尽管遭受多次攻击，她对正义的信念仍然坚定不移，成为许多人的希望之光。