Word Type

Adjective

Adjective

The word "impervious" can be used as adjective and adjective.

Word Relationships

Opposites (Antonyms)

pervious pervious

Derived Terms

imperviously imperviousness impervium

Related Terms

affected damage effect immune impenetrable impermeable penetration preventive unaffected

Similar Terms

acid fast acid-fast colorfast colorfast corrosion resistant corrosion-resistant fast fast greaseproof greaseproof impermeable ladder-proof moth resistant moth-resistant mothproof proof proof resistant resistant rot resistant rot-resistant run resistant run-resistant runproof soundproof soundproof

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