impervious /ɪmˈpɚvijəs/ adjective Learner's definition of IMPERVIOUS
[more impervious; most impervious]
1
technical : not allowing something (such as water or light) to enter or pass through(水或光等)不能透过的,不能渗透的 —
usually + to 2
formal : not bothered or affected by something不受影响的 —
usually + to
— imperviousness
noun [noncount]