Select the most appropriate ANTONYM of the given word.
Aggravate

The correct answer is Alleviate.

Understanding the Given Word:
- Aggravate: This verb means to make a problem, injury, or offensive situation worse, more serious, or more severe. For example, "stress can aggravate medical conditions." It can also mean to annoy or exasperate someone.

Analyzing the Options:
- Exasperate: This means to irritate or annoy someone intensely. It is closely related in meaning (synonymous) to one of the senses of aggravate, rather than being an antonym.
- Alleviate: This means to make suffering, deficiency, or a problem less severe or more bearable. For example, "measures were taken to alleviate the shortage." Since making something less severe is the direct opposite of making it worse, "Alleviate" is the antonym of "Aggravate."
- Humiliate: This means to make someone feel ashamed and foolish by injuring their dignity and self-respect.
- Ignorant: This adjective describes someone who lacks knowledge, information, or education.

Therefore, Alleviate is the most appropriate antonym of Aggravate.