impermeable

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im·per·me·a·ble / imˈpərmēəbəl/ • adj. not allowing fluid to pass through: an impermeable membrane. ∎  not liable to be affected by pain or distress; insusceptible or imperturbable: women who appear impermeable to pain.DERIVATIVES: im·per·me·a·bil·i·ty / -ˌpərmēəˈbilitē/ n.