Adjective

(-)

Not penetrable.

The fortress is impenetrable , so it cannot be taken.

* '>citation

The avalanche spread and stopped, locking everything it carried into an icy cocoon. It was now a jagged, virtually impenetrable pile of ice, longer than a football field and nearly as wide.

(figuratively) ; inscrutable.

Business jargon makes this document impenetrable , I can't understand it.

Adjective

(en adjective)

Unable to be perceived by the senses.

* Sir Thomas Browne

Two small and almost insensible pricks were found upon Cleopatra's arm.

* Dryden

They fall away, / And languish with insensible decay.

Incapable or deprived of physical sensation.

* {{quote-book, year=1905, author=

, title= , chapter=1 citation , passage=“[…] Captain Markam had been found lying half-insensible , gagged and bound, on the floor of the sitting-room, his hands and feet tightly pinioned, and a woollen comforter wound closely round his mouth and neck?; whilst Mrs. Markham's jewel-case, containing valuable jewellery and the secret plans of Port Arthur, had disappeared. […]”}}

Unable to be understood; unintelligible.

Not sensible or reasonable; meaningless.

* Sir M. Hale

If it make the indictment be insensible or uncertain, it shall be quashed.

Incapable of mental feeling; indifferent.

* Dryden

Lost in their loves, insensible of shame.

* Sir H. Wotton

Accept an obligation without being a slave to the giver, or insensible to his kindness.

* 1813 , Jane Austen, Pride and Prejudice , Modern Library Edition (1995), page 138

In spite of her deep-rooted dislike, she could not be insensible to the compliment of such a man's affection...

Incapable of emotional feeling; callous; apathetic.