Rare standalone noun. Mostly encountered in classical or formal contexts. In modern Japanese, the meaning 'bad habit' is more commonly expressed by 悪癖 or 悪習, and 'harm' by 害.
Humble prefix attached to nouns referring to one's own company, organization, or group (e.g., 弊社 'our company'). Used in business correspondence and formal speech to show modesty about one's in-group.
