Impervious

//ɪmˈpɜːvi.əs// adj

adj ·Moderate ·High school level

Definitions

Adjective
  1. 1
    Unaffected or unable to be affected by something.

    "The man was completely impervious to the deception we were trying."

  2. 2
    Preventive of any penetration; impenetrable, impermeable, particularly of water.

    "Although patchworked and sagging, the roof proved impervious to the weather."

  3. 3
    Immune to damage or effect.

    "The old car seemed to be impervious to the wear and tear of age."

Adjective
  1. 1
    not admitting of passage or capable of being affected wordnet

Synonyms

All synonyms
proofresistantsoundproofacid fastairtightanesthetic

Example

More examples

"Galoshes are impervious to water."

Etymology

From Latin impervius (“that cannot be passed through”), from in- (“not”) + pervius (“letting things through”).

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.