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Adjective: imperviable
  1. Not admitting of passage or capable of being affected
    - impervious

See also: acid-fast, colorfast [US], colourfast [Brit, Cdn], corrosion-resistant, fast, greaseproof, impermeable, ladder-proof, mothproof, moth-resistant, proof, resistant, rot-resistant, runproof, run-resistant, soundproof

Nearest

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impersonation
impersonator
impertinence
impertinent
impertinently
imperturbability
imperturbable
imperturbableness
imperturbably
imperviable
impervious
imperviousness
impetiginous
impetigo
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impetuosity
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impetuously
impetuousness
impetus