is a concept in ethics used to describe undesirable circumstances or events.
may also be:
- Bad (economics) , a concept in economics which is used to describe an object or situation that is harmful to the persons affected by it, in contrast to a good
- ''Bad'' (album) , a 1987 Michael Jackson album
- "Bad" (Michael Jackson Song) , a song from that album
- "Bad" (U2 Song) , a song by the rock band U2
- '' Andy Warhol's Bad '', a 1977 film
- In Germany, the first part of the names of most Spa Town s, a cognate to the English "bath"
- Bcl-2-associated Death Promoter , a pro-apoptotic protein
- Bad, Uttar Pradesh , a census town in India
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