Find the antonym of 'Aggravate'

Aggravate means
1. to make (a problem, injury, or offence) worse or more serious.
2. informal Annoy or exasperate.

Synonym:
1. worsen, make worse, exacerbate, inflame, compound
2. annoy, irritate, exasperate, anger, irk, vex, put out, nettle, provoke, incense, rile, infuriate, antagonize, get on someone's nerves, rub up the wrong way, make someone's blood boil, ruffle someone's feathers, ruffle, try someone's patience, make someone's hackles rise

Intensify means become or make more intense.
Worsen means make or become worse.
Exacerbate means to make (a problem, bad situation, or negative feeling) worse.
Mitigate means make (something bad) less severe, serious, or painful.