Choose the most appropriate ANTONYM of the given word.

ALLY

Detractor 

The most appropriate antonym of the word ALLY is DETRACTOR.

• Ally means "a person or group that supports or helps another."
• Detractor means "a person who criticizes or speaks adversely of someone or something."

The other words do not have the same meaning as detractor.

• Divulge means "to make known something that was previously secret or unknown."
• Symptomatic means "indicating or characteristic of a particular disease or condition."
• Reverberating means "echoing or resounding."