1. Noun
Quality of being impenetrable.
2. Noun
That property in virtue of which two portions of matter can not at the same time occupy the same portion of space.
3. Noun
Insusceptibility of intellectual or emotional impression; obtuseness; stupidity; coldness.
4. Noun
the quality of being impenetrable (by people or light or missiles etc.)
Vocabulary classified under Academic vocabulary
5. Noun
incomprehensibility by virtue of being too dense to understand
Vocabulary classified under Environmental science
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