Unpenetrable vs. Impenetrable: What's the Difference?
Unpenetrable is a less common, archaic form meaning something that cannot be penetrated, while impenetrable is the widely accepted and used term meaning the same.
Unpenetrable and Impenetrable Definitions
Unpenetrable
Impenetrable
Impenetrable
Impossible to penetrate or enter
An impenetrable fortress.
Unpenetrable
Impenetrable.
Impenetrable
Impossible to understand; incomprehensible
Impenetrable jargon.
Impenetrable
Impervious to sentiment or argument
An impenetrable heart.
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Impenetrable
Not penetrable.
The fortress is impenetrable, so it cannot be taken.
Impenetrable
(figuratively) Incomprehensible; fathomless; inscrutable.
Business jargon makes this document impenetrable, I can't understand it.
Impenetrable
Opaque; obscure; not translucent or transparent.
When night falls, she cloaks the world in impenetrable darkness.
Impenetrable
A person not openly given to friendship.
Impenetrable
Incapable of being penetrated or pierced; not admitting the passage of other bodies; not to be entered; impervious; as, an impenetrable shield.
Highest woods impenetrableTo star or sunlight.
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Impenetrable
Having the property of preventing any other substance from occupying the same space at the same time.
Impenetrable
Inaccessible, as to knowledge, reason, sympathy, etc.; unimpressible; not to be moved by arguments or motives; as, an impenetrable mind, or heart.
They will be credulous in all affairs of life, but impenetrable by a sermon of the gospel.
Impenetrable
Not admitting of penetration or passage into or through;
An impenetrable fortress
Impenetrable rain forests
Impenetrable
Permitting little if any light to pass through because of denseness of matter;
Dense smoke
Heavy fog
Impenetrable gloom
Impenetrable
Impossible to understand;
Impenetrable jargon
