impervious

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im·per·vi·ous / imˈpərvēəs/ • adj. not allowing fluid to pass through: an impervious layer of basaltic clay. ∎  (impervious to) unable to be affected by: he worked, apparently impervious to the heat.DERIVATIVES: im·per·vi·ous·ly adv.im·per·vi·ous·ness n.

impervious

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impervious XVII. — L.; see IM-2, PERVIOUS.