Definition of impervious
- a coat impervious to rain
- a carpet impervious to rough treatment
- impervious to criticism
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the material for this coat is supposed to be impervious to rain
the rain forest is impervious to all but the most dedicated explorers
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'impervious.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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."
First Known Use: 1640See Words from the same year
: not allowing something (such as water or light) to enter or pass through
: not bothered or affected by something
What made you want to look up impervious? Please tell us where you read or heard it (including the quote, if possible).
without deliberation, pause, or delay
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