impenetrable
Not penetrable.
Example
“The fortress is impenetrable, so it cannot be taken.”
Other meanings
Opaque; obscure; not translucent or transparent.
Incomprehensible; fathomless; inscrutable.
“Business jargon makes this document impenetrable—I can’t understand it.”
Related words
- impenetrableness
- impenetrably
Word history
From Latin "impenetrābilis".
Where this comes from
This definition is adapted from “impenetrable” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.