inpenetrable

Adjective

impenetrable (not comparable)

1. Not penetrable.
   • The fortress is impenetrable, so it cannot be taken.

   Synonyms:

   impermeable, impregnable

   Antonyms:

   penetrable, permeable, pregnable

2. Opaque; obscure; not translucent or transparent.
   • When night falls, she cloaks the world in impenetrable darkness.1991, Varg Vikernes, “Dunkelheit”, performed by Burzum
3. (figuratively) Incomprehensible; fathomless; inscrutable.
   • Business jargon makes this document impenetrable—I can’t understand it.

   Synonyms:

   unfathomable, abstruse, Chinese, dense, enigmatic, fathomless, bottomless, Greek, inapprehensible, incognizable

   Antonyms:

   fathomable, apprehensible, clear, limpid, comprehensible, explainable, explicable, explicatable, graspable, illuminable

See all 4 meanings of impenetrable