What is the meaning of impenetrable?

adjective

  • Not admitting of penetration or passage into or through.
    • usage: "an impenetrable fortress"; "impenetrable rain forests"
  • Permitting little if any light to pass through because of denseness of matter.
    • usage: "dense smoke"; "heavy fog"; "impenetrable gloom"
  • Impossible to understand.
    • usage: "impenetrable jargon"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). impenetrable. Retrieved September 20, 2026, from http://smartdefine.org/impenetrable/definitions/1176175
ChicagoWordNet. 2010. "impenetrable" http://smartdefine.org/impenetrable/definitions/1176175 (accessed September 20, 2026).
HarvardWordNet 2010, impenetrable, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/impenetrable/definitions/1176175>.
MLAWordNet. "impenetrable" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/impenetrable/definitions/1176175>
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