 impenetrable |
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| 1. | [ adjective ] not admitting of penetration or passage into or through | |
| Examples: | "an impenetrable fortress" "impenetrable rain forests" |
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| Related terms: | penetrable dense | |
| 2. | [ adjective ] permitting little if any light to pass through because of denseness of matter | |
| Synonyms: | dense heavy | |
| Examples: | "dense smoke" "heavy fog" "impenetrable gloom" |
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| Related terms: | thick | |
| 3. | [ adjective ] impossible to understand | |
| Examples: | "impenetrable jargon" |
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| Related terms: | incomprehensible | |
| Similar spelling: |
impenetrability impenitent impendence impenitently |
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