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impenetrable

• (a) not admitting of penetration or passage into or through
  • an impenetrable fortress
  • impenetrable rain forests
• (s) permitting little if any light to pass through because of denseness of matter
  • dense smoke
  • heavy fog
  • impenetrable gloom
  dense, heavy,
• (s) impossible to understand
  • impenetrable jargon

Synonyms

dense heavy

Antonyms

penetrable

Words of close approximity