What is another word for impenetrable?

Need synonyms for impenetrable? Here's a list of words from our thesaurus that you can use instead.

Adjective
Impossible to get through or into
“The range forms an impenetrable barrier between Europe and Asia.”
Adjective
Impossible to understand
“But as a technology columnist, I'm in the business of coming up with confusing and impenetrable reactions to events around me.”
Adjective
Impossible to pass through or enter
“But the circle of outraged nobles had made an almost impenetrable wall surrounding the king and the prince.”
Adjective
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