Impenetrable
adjective
Impossible to pass through or understand
“The cipher remained impenetrable for two hundred years.”
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What does impenetrable mean?
Commonly confused with
- NotEasily solved
- NotWidely published
- NotPartially damaged
Nearby words
Impenetrable is one of 1,969 SAT words in Professor Tas, a free story game where you learn them in context instead of from a list.
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