Meaning & use
impenetrable
Last updated
Impossible to enter, pass through, or understand.
See it in a sentence
The castle's impenetrable walls withstood every siege for centuries.
The legal contract was written in nearly impenetrable jargon.
A note on using this word
Impenetrable can describe a physical barrier or, figuratively, something too complex or confusing to understand.
Words with a similar meaning
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
penetrableaccessible
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