impervious [ɪmˈpɜ:viəs]

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adj.不能渗透的，不能穿过的，不易伤害的

not allowing liquid to go through

He was completely impervious to criticism. 他对批评毫不在乎。
This material is impervious to gases and liquids. 气体和液体都透不过这种物质。