Synonyms to impermeable

anesthetic, Mickey Finn, Pentothal, alleviating, alleviative, analgesic, anodyne, assuasive, balmy, balsamic, benumbing, cathartic, chloroform, cleansing, cocaine, deadening, demulcent, dope, drug, dull, dulling, easing, emollient, ether, ethyl chloride, ethylene, gas, hard, hypnotic, impassible, impenetrable, impervious, insensate, insensitive, knockout drop, lenitive, lullaby, mandrake, menthol, mitigating, mitigative, morphia, morphine, narcotic, nightcap, nitrous oxide, numbing, obtuse, opiate, opium, pain-killer, pain-killing, palliative, poppy, purgative, relieving, remedial, rocky, sedative, sleep-bringer, sleep-inducer, sleep-producer, sleeping pill, softening, somnifacient, soothing, soporific, stunning, stupefying, subduing, tranquilizer, close, Autobahn, Spartan, US highway, abandonment, abbreviated, abort, about, about to be, abridged, abstruse, accented, accommodate, accost, accurate, adjacent, adjust, advance, agree, airless, airtight, alert, all but, alley, alleyway, almost, along toward, alongside, already in sight, alveolar, angustifoliate, angustirostrate, angustisellate, angustise