What does bad mean?

1. Poor; not achieving an acceptable standard; a bad result.
2. Sinful; wicked; evil;
3. Vulgar or obscene: bad language.
4. Disobedient or naughty: bad dog!
5. Unpleasant, or disturbing: a piece of bad news.
6. Unfavorable: bad reviews for the play.
7. Not fresh; rotten or spoiled: bad egg.
8. Injurious; detrimental: bad habits.
9. Not working properly; defective: bad reception.
10. Full of or showing faults or errors: bad spelling.
11. Having no validity; void: bad cheques.
12. Being so far behind in payments as to be considered a loss: bad debt.
13. Severe; intense: a bad flu
14. Being in poor health or in pain: He felt bad yesterday.
15. Being in poor condition; diseased: bad hips
16. Sorry; regretful: She feels bad about how she treated you.