- An example of something impenetrable is an overgrown hiking trail; an impenetrable trail.
- An example of something impenetrable is a riddle that has never been figured out.
The definition of impenetrable is cannot be passed through or solved.
- that cannot be penetrated or passed through: an impenetrable jungle
- that cannot be solved or understood; unfathomable; inscrutable
- unreceptive to ideas, impressions, influences, etc.
- Physics having that property of matter by which two bodies are prevented from occupying the same space at the same time
Origin of impenetrableMiddle English inpenetrable ; from French impénétrable ; from Classical Latin impenetrabilis
- Impossible to penetrate or enter: an impenetrable fortress.
- Impossible to understand; incomprehensible: impenetrable jargon.
- Impervious to sentiment or argument: an impenetrable heart.
From Middle French impenetrable, from Latin impenetrabilis.