impenetrable
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im·pen·e·tra·ble

adjective \(ˌ)im-ˈpe-nə-trə-bəl\

Definition of IMPENETRABLE

1
a : incapable of being penetrated or pierced
b : inaccessible to knowledge, reason, or sympathy : impervious
2
: incapable of being comprehended : inscrutable
im·pen·e·tra·bly \-blē\ adverb

Examples of IMPENETRABLE

  1. The fort's defenses were thought to be impenetrable.
  2. <the ancient temple was surrounded by vast stretches of impenetrable jungle>

Origin of IMPENETRABLE

Middle English impenetrabel, from Middle French impenetrable, from Latin impenetrabilis, from in- + penetrabilis penetrable
First Known Use: 15th century

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