Choose the most appropriate ANTONYM of the given word.

INEFFECTUAL 

Adequate

The most appropriate antonym of the word INEFFECTUAL is ADEQUATE.

• Ineffectual means "not producing any significant or desired effect."
• Adequate means "sufficient or enough to meet a need or requirement."

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

• Entourage means "a group of people who accompany a person of importance."
• Indiscreet means "not showing good judgment or careful thought; rash or reckless."
• Amicable means "friendly and peaceable."