impenetrable

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im·pen·e·tra·ble / imˈpenətrəbəl/ • adj. 1. impossible to pass through or enter: a dark, impenetrable forest. ∎  (of a club or group) secretive and exclusive: an impenetrable clique. ∎  impervious to new ideas or influences: his career shows just how impenetrable European assumptions were. ∎  Physics (of matter) incapable of occupying the same space as other matter at the same time.2. impossible to understand: impenetrable interviews with French intellectuals.DERIVATIVES: im·pen·e·tra·bil·i·ty / -ˌpenətrəˈbilitē/ n.im·pen·e·tra·bly / -blē/ adv.