WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / I / imperviousness imperviousness noun 14 letters Scrabble 21 WWF 26 Definitions noun the quality of being impenetrable (by people or light or missiles etc.) impenetrability Look “imperviousness” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →