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Noun: imperviousness  im'pur-vee-us-nus
  1. The quality of being impenetrable (by people or light or missiles etc.)
    - impenetrability

Derived forms: imperviousnesses

See also: impervious

Type of: quality

Antonym: perviousness

Nearest

impersonator
impertinence
impertinent
impertinently
imperturbability
imperturbable
imperturbableness
imperturbably
imperviable
impervious
imperviousness
impetiginous
impetigo
impetrate
impetuosity
impetuous
impetuously
impetuousness
impetus
impi
impiety