impenetrable

• Qui ne peut être pénétré, traversé ou compris.

Describes something that cannot be entered, passed through, or understood.

1. Impossible to enter or pass throughB2formal

   Not allowing anything to pass through; impossible to get into or through.

   impénétrable

   • The fortress had impenetrable walls.
   • The jungle was so dense it was nearly impenetrable.
   • The security system was designed to be impenetrable.

   Synonymesimpassableimpermeableimperviousnonporousunpassable

   Antonymespenetrablepermeableporous

2. Very dense, blocking lightB2formal

   So dense or thick that light cannot pass through.

   Imperméable à la lumière

   • An impenetrable fog covered the city.
   • The forest was dark due to the impenetrable canopy of leaves.
   • The glass was treated to be impenetrable to UV rays.

   Synonymeslight-tightlightproofopaque

   Antonymesclearsee-throughtranslucenttransparent

3. Impossible to understandC1formal

   Not able to be understood or comprehended.

   Impossible à comprendre

   • The professor's lecture was impenetrable to the students.
   • The legal document was filled with impenetrable jargon.
   • His motives remained impenetrable to everyone.

   Synonymesabstrusebafflingenigmaticincomprehensibleinscrutableopaquepuzzlingreconditeunfathomableunintelligible

   Antonymesclearcomprehensibleintelligiblepenetrableunderstandable