疯
fēng · HSK 5
mad
🌀 疯 = 疒 (sickness radical) + 风 (wind); a 'wind-sickness' meaning madness
The 疒 radical marks illness-related characters, and 风 (fēng, wind) supplies the sound. Old Chinese medicine blamed sudden madness on harmful 'wind' invading the body, so 疯 literally encodes a wind-borne sickness.
疯 — sickness radical 疒 + wind 风 (fēng, phonetic)
A semantic-phonetic compound. The outer 疒 marks illness, while 风 (wind) supplies the sound and an older medical idea: ancient Chinese medicine blamed sudden 'wind' invading the body for fits and madness. So 疯 came to mean crazy or insane.