Definition of Impenetrable

not capable of being entered

Examples of Impenetrable in a sentence

If the castle is truly impenetrable, our enemies will never gain access to the king.  

Parents will love our company’s impenetrable security system.  

Since the jungle was impenetrable, we had to find an alternate route to the village.  

Do you think the train company will be able to clear a path through the impenetrable mountain?  

Without a sledgehammer, there is no way we can break through the impenetrable wall.  

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