FEEBLE

Answer: Option A

Weak : lacking the power to perform physically demanding tasks.
Vain : having or showing an excessively high opinion of one's appearance, abilities, or worth.
Arrogant : having or revealing an exaggerated sense of one's own importance or abilities.
Sick : affected by physical or mental illness.
Feeble : lacking physical strength, especially as a result of age or illness.


Synonym of Feeble is Weak