neglect of health; unhealthy lifestyle
Refers to a pattern of not taking care of one's health, often through poor diet, lack of sleep, or overwork. Used as a noun or adjectival noun.
My neglect of health caught up with me, and I ruined my health.
His unhealthy lifestyle habits are worrying.
Compound of 不 (fu, 'not') and 養生 (youjou, 'health care'). The exact historical derivation is uncertain, but the word is conventionally associated with the meaning of neglecting health.