Impenetrable Definition

ĭm-pĕnĭ-trə-bəl
adjective
Impossible to penetrate or enter.
An impenetrable fortress.
American Heritage
That cannot be penetrated or passed through.
An impenetrable jungle.
Webster's New World
That cannot be solved or understood; unfathomable; inscrutable.
Webster's New World
Impossible to understand; incomprehensible.
Impenetrable jargon.
American Heritage
Impervious to sentiment or argument.
An impenetrable heart.
American Heritage

Origin of Impenetrable

  • From Middle French impenetrable, from Latin impenetrabilis.

    From Wiktionary

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impenetrable