1) Acid-fast 2) Colorfast 3) Fast 4) Greaseproof 5) Impermeable 6) Imperviable 7) Incapable of being affected 8) Ladder-proof 9) Moth-resistant 10) Mothproof 11) Not allowing to pass through 12) Proof 13) Resistant 14) Run-resistant 15) Runproof 16) Shockproof 17) Soundproof 1) Colorfast 2) Fearless 3) Greaseproof 4) Immune 5) Impermeable 6) Imperviable 7) Mothproof 8) Proof 9) Resistant 10) Runproof 11) Soundproof 12) Unchanged 
• (a.) Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air.
is a term used to describe materials which resist the passage of water.
Synonym for impermeable ... Not permeable; not permitting the passage of substances (e.g., liquids, gases) or heat through a membrane or other structure. ... Synonym: impervious. ... Origin: L. Im-permeabilis, not to be passed through ... (05 Mar 2000) ... 
Im·per'vi·ous adjective [ Latin impervius ; prefix im- not + per through + via way. See Voyage .] Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air. « This gulf impassable, impervious .�...
not allowing to pass through (of materials)Â 
Type: Term Pronunciation: im-per′vē-ŭs Synonyms: impermeable
[adj] - not admitting of passage or capable of being affected
[The Tempest] not affected by something or not feeling the effects of something.
imperviable adjective not admitting of passage or capable of being affected; `a material impervious to water`; `someone impervious to argument`
Soil that has become tightly packed because of foot traffic, construction etc.
not permitting penetration or passage; impenetrable: The coat is impervious to rain. · incapable of being injured or impaired: impervious to wear and tear. · incapable of being influenced, persuaded, or affected: impervious to reason; impervious to another's suffering.
not admitting of passage or capable of being affected not admitting of passage or capable of being affected[SBAC wordlist] not admitting of passage or capable of being affected[ACT vocabulary] not admitting of passage or capable of being affected