impenetrable

Everyday

1. Impenetrable means impossible to get through, into or see through, like a thick forest or a strong wall. tree →
2. Impenetrable also means impossible to understand, like a very difficult text. tree →

In the lessons

In stories, an impenetrable forest, fog or fortress makes the hero's journey hard. In science, a material that water or light cannot pass through can be called impenetrable. In everyday life, a book full of jargon may be called impenetrable. Phrases: impenetrable jungle, impenetrable darkness, impenetrable defence.

Examples

• The castle walls were impenetrable. tree →
• They hacked a path through the impenetrable jungle. tree →
• The fog was so thick it was impenetrable. tree →
• The instructions were impenetrable; nobody understood them. tree →
• Our team's defence was impenetrable all season. tree →
• The darkness of the cave was impenetrable. tree →
• It was pleasant to stand on a branch that swayed and sprung, and it was good to stare at an impenetrable roof of leaves and then climb into it. tree →

Note

«Im-» means not; «penetrate» means go into or through. Say «im-PEN-i-tra-bul». The opposite «penetrable» is rarely used.