形容词
中文翻译：Unknown
同义词：
['unassailable', 'unassailable', 'indefeasible', 'impregnable', 'invulnerable']
例句：
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1. The non-assessable nature of this project makes it difficult to quantify its impact.
这个项目的不可评估性质使得很难量化其影响。
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2. The indefeasible rights of the people are unassailable.
人民不可侵犯的权利是不可动摇的。
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3. The impregnable fortress was a formidable opponent to any attack.
坚不可摧的堡垒是任何攻击者都无法攻克的对手。