Antonym of ENOUGH

Answer: Option A

Enough : as much or as many as required.
Inadequate : lacking the quality or quantity required; insufficient for a purpose.
Scarce : (especially of food, money, or some other resource) insufficient for the demand.
Deficit : the amount by which something, especially a sum of money, is too small.
Less : a smaller amount of; not as much.

Antonym of Enough is Inadequate