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impenetrable
'impenetrable' - used as an adjective
1. not admitting of penetration or passage into or through
an impenetrable fortress
impenetrable rain forests
2. permitting little if any light to pass through because of denseness of matter
impenetrable gloom
3. impossible to understand
impenetrable jargon
See also
 
Antonym
  • penetrable
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    Traditionally, wild cabbage was used as an aphrodisiac.