The best antonym for aggravate is alleviate.
- Aggravate means to make worse or more severe.
- Alleviate means to make something less severe or troublesome.
The other options are not opposites of aggravate.
- Abbreviate means to shorten or reduce the length of something.
- Advocate means to support or recommend something.
- Appreciate means to value or esteem something highly.
| 
