Answer:
anger
More information:
The "basic emotions" are those that are the most simple and are not derived from some other feeling. One easily remembered formula is : Sad / Mad / Glad / or Scared.
For example, a person might feel jealousy. When examined, jealousy is a combination of being sad because of a loved one's behavior, mad at that loved one, and scared of losing love.
Another example might be hope, which could be roughly interpreted as glad and scared.