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impervious

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impervious/ɪmˈpɚvijəs/adjective
impervious
/ɪmˈpɚvijəs/
adjective
Learner's definition of IMPERVIOUS  
[more impervious; most impervious]
technical : not allowing something (such as water or light) to enter or pass through— usually + to
formal : not bothered or affected by something— usually + to

— imperviousness

noun,[noncount]
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