bad

adjective:of poor quality or low standard; not good or desirable
- The movie received bad reviews from the critics.
adjective:morally wrong, evil, or wicked
- Bad behaviors can be eliminated by education.
adjective:unfavorable, adverse, or harmful
- Smoking has bad effects on your health.
adjective:serious or severe in degree
- He made a bad mistake that cost the company a lot of money.
adjective:rotten or spoiled, especially referring to food
- This milk smells bad; we should throw it away.
noun:that which is harmful, undesirable, or of poor quality
- You have to take the good with the bad in life.
adverb:in a severe or serious manner; badly
- He wanted to win the race so bad that he trained every day.