形容词
中文翻译：不可推翻的
同义词：
['unchangeable', 'indispensable', 'impregnable']
例句：
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1. The government's decision was indefeasible, and it could not be changed.
政府的决策是不可推翻的，不能更改。
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2.The castle is indefeasible, and no one can take it away from us.
城堡是坚不可摧的，没有人能从我们这里夺走它。
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3.The plan was indefeasible, and we had to follow it to the letter.
计划是不可改变的，我们必须严格按照它的要求去做。