Choose the most appropriate ANTONYM of the given word.

FUTILE

Effective 

The most appropriate antonym of the word futile is effective.

• Futile means "having no useful result or purpose; pointless."
• Effective means "producing a desired or intended result; successful."

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

• Fundamental means "forming the basis or foundation of something."
• Ferocity means "savage or violent behavior."
• Erratic means "irregular or unpredictable."