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impervious

[im-pur-vee-uh s] /ɪmˈpɜr vi əs/
adjective
1.
not permitting penetration or passage; impenetrable:
The coat is impervious to rain.
2.
incapable of being injured or impaired:
impervious to wear and tear.
3.
incapable of being influenced, persuaded, or affected:
impervious to reason; impervious to another's suffering.
Also, imperviable
[im-pur-vee-uh-buh l] /ɪmˈpɜr vi ə bəl/ (Show IPA)
.
Origin
1640-1650
1640-50; < Latin impervius. See im-2, pervious
Related forms
imperviously, adverb
imperviousness, noun
Can be confused
impermeable, impervious.
Synonyms
3. invulnerable, closed.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for imperviously

impervious

/ɪmˈpɜːvɪəs/
adjective
1.
not able to be penetrated, as by water, light, etc; impermeable
2.
(often postpositive) foll by to. not able to be influenced (by) or not receptive (to): impervious to argument
Derived Forms
imperviously, adverb
imperviousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for imperviously

impervious

adj.

1640s, from Latin impervius "that cannot be passed through," from assimilated form of in- "not, opposite of" (see in- (1)) + pervius "letting things through," from per "through" + via "road." Related: Imperviously; imperviousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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