- 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.