insane, mad

瘋 is composed of 疒 (sickness) and 風 (wind). 疒 signifies illness or physical disorder, while 風 represents the wind. The mental state of a person experiencing insanity or delusion is unpredictable and unstable—drifting unpredictably like the wind. Thus, 瘋 was formed to denote madness, insanity, or erratic behavior.