Rotten is an adjective that primarily means decayed or decomposed, especially of organic matter.
Other meanings include:
1. Very bad or unpleasant (That's a rotten idea!)
2. Corrupt or dishonest (The whole system is rotten)
3. Feeling ill or unwell (I feel rotten today)
4. Used as an intensifier (That's rotten luck!)
Common phrases:
- Rotten to the core (坏透了)
- Rotten apple (害群之马)
- Rotten weather (糟糕的天气)