Top Definition

1. Impossible to get in or through: Not able to be passed through or entered.

2. Incomprehensible: Impossible to understand or discern.

3. Closed to influence: Not open to intellectual or moral influences, impressions, or ideas.
1. The woods formed an impenetrable barrier.
2. An impenetrable legal jargon.
by Jafje March 31, 2007

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