STUPIDITY. The Greek word stupor corresponds most with our English word stupidity or foolishness, (in the common acceptance of it), which is, when reason is rendered somewhat defective. The immediate causes are, a deficiency of vital heat, or a defect in the brain. Stupid children sometimes become sprightly youths; but if stupidity continues to the age of puberty, it is hardly ever removed. If stupidity follows upon a violent passion, an injury done to the head, or other evident cause, if it continues long, it becomes incurable. But the stupidity which consists in a loss of memory, and succeeds a lethargy, spontaneously ceases when the lethargy is cured.