| impenetrable wall | 0.99 | It creates impenetrable walls. | ||
| impenetrable barrier | 0.92 | It seemed an impenetrable psychological barrier. | ||
| impenetrable fog | 0.53 | Then they hit impenetrable fog. | ||
| impenetrable shield | 0.39 | It did not promise an impenetrable shield. | ||
| impenetrable blackness | 0.33 | Somewhere in the impenetrable blackness was a desperate man, cold, hungry, hunted. | ||
| impenetrable bureaucracy | 0.26 | Owners of small farms, like Bonilla, complain about the lack of credit and the impenetrable bureaucracy. | ||
| impenetrable defense | 0.26 | New Zealand shackled the South Africans through its tight tackling and an almost impenetrable defense. | ||
| impenetrable jungle | 0.26 | On either side is impenetrable jungle. | ||
| impenetrable layer | 0.26 | It matted down to form an impenetrable layer, similar to a pile of whole sheets. | ||
| impenetrable mangrove | 0.26 | Four villages built on exposed sand spits were washed into the lagoon, which remains littered with bodies caught in impenetrable mangroves. | ||
| impenetrable thicket | 0.26 | Recently Ms. Vierny searched for the route, only to be confronted by an impenetrable thicket. |