impenetrable
[ɪmˈpɛnɪtrəbəl]
adj.
不能通过的;
不能理解的;
无动于衷的;
顽固的，不接受的;
例句:
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Their jargon is impenetrable to an outsider.
他们的行话外人听不懂。
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I find his style somewhat impenetrable.
我发现他的行为方式令人颇为费解.
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The language of this document would be impenetrable to anyone except a specialist.
除了专家,其他任何人都看不懂这份文件.
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Hawthorn Hawthorns create natural and almost perfectly impenetrable barriers.
来自BBC
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Your mind is not simply closed but actually impenetrable!
来自SA
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Mr. Dabashi has a fatal penchant for impenetrable jargon.
来自WSJ