Select the most appropriate ANTONYM of the given word.

Vigorous

Frail

The most appropriate antonym of the word vigorous is frail.

• Vigorous means full of energy and strength.
• Frail means weak or delicate.

The other words listed are not antonyms of vigorous.

• Buoyant means full of energy and hope.
• Sturdy means strong and well-built.
• Robust means strong and healthy.