impenetrable

Definition

Not penetrable.

Etymology

From Middle English inpenetrabel, inpenetrabyle, from Middle French impenetrable or directly from its etymon, Latin impenetrābilis. By surface analysis, im- + penetrable.

Example Sentences

• "The fortress is impenetrable, so it cannot be taken."
• "The avalanche spread and stopped, locking everything it carried into an icy cocoon. It was now a jagged, virtually impenetrable pile of ice, longer than a football field and nearly as wide."
• "When night falls, she cloaks the world in impenetrable darkness."