Definition of impervious
1a : not allowing entrance or passage : impenetrable a coat impervious to rainb : not capable of being damaged or harmed a carpet impervious to rough treatment
2 : not capable of being affected or disturbed impervious to criticism
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Examples of impervious in a sentence
… Berlin struck me, above all, as impervious to any political reactions whatever … —Stephen Spender, New York Times Magazine, 30 Oct.1977
He looked at her, impervious to her tears … —Jean Stafford, Children Are Bored on Sunday, (1945) 1953
… the trunk … is encased in so hard a bark, as to be almost impervious to a bullet … —Herman Melville, Omoo, 1847
the material for this coat is supposed to be impervious to rain
the rain forest is impervious to all but the most dedicated explorers
Did You Know?
The English language is far from impervious, and, of course, a great many Latinate terms have entered it throughout its history. Impervious is one of the many that broke through in the 17th century. It comes from the Latin impervius, which adds the prefix im- to pervius, meaning "passable" or "penetrable." Pervius-which is also the source of the relatively uncommon English word pervious, meaning "accessible" or "permeable"-comes from per-, meaning "through," and via, meaning "way."
Origin and Etymology of impervious
Latin impervius, from in- + pervius pervious
First Known Use: 1640
IMPERVIOUS Defined for English Language Learners
Definition of impervious for English Language Learners
: not allowing something (such as water or light) to enter or pass through
: not bothered or affected by something
IMPERVIOUS Defined for Kids
Definition of impervious for Students
1 : not letting something enter or pass through The coat is impervious to rain.
2 : not bothered or affected by something He's impervious to their criticism.
Medical Definition of impervious
: not allowing entrance or passage medication packaged in a container impervious to air and light
Seen and Heard
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