Choose the most appropriate ANTONYM of the given word.

AFFIRM

Dispute 

The most appropriate antonym of the word affirm is dispute.

• Affirm means "to state or declare something positively or with confidence."
• Dispute means "to argue or debate about something; to express disagreement with something."

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

• Abstract means "not concrete or specific; theoretical."
• Acquisition means "the act of gaining or acquiring something."
• Abate means "to decrease or diminish in intensity or amount."