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Impenetrability is a 15 letter word which starts with the letter I and ends with the letter Y for which we found 3 definitions.

(n.) Quality of being impenetrable.
(n.) That property in virtue of which two portions of matter can not at the same time occupy the same portion of space.
(n.) Insusceptibility of intellectual or emotional impression; obtuseness; stupidity; coldness.
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