Impenetrable

adjective

/ɪmˈpɛnətɹəbəl/

Word Frequency: 1.4

Definitions

1.adjectiveNot penetrable.

"The fortress is impenetrable, so it cannot be taken."

2.adjectiveIncomprehensible; fathomless; inscrutable.

"Business jargon makes this document impenetrable, I can't understand it."

3.adjectiveOpaque; obscure; not translucent or transparent.

"When night falls, she cloaks the world in impenetrable darkness."

The Daily Word NerdA new word, a puzzle, and a fun fact — free in your inbox every morning.

Free forever · unsubscribe anytime · all 14 newsletters

That email did not go through — please check it and try again.