Synonyms to impassible

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, impenetrable, impermeable, 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, anesthetized, affectless, arctic, asleep, autistic, benumbed, blunt, cataleptic, catatonic, chill, chilly, cold, cold as charity, cold-blooded, coldhearted, comatose, cool, dead, deadened, dispassionate, doped, dozy, dreamy, drowsy, drugged, drugged with sleep, emotionally dead, emotionless, frigid, frosted, frosty, frozen, half asleep, heartless, hea