Inadequacy

[Sarah]

The quality or state of being inadequate or insufficient;defectiveness; insufficiency; inadequateness.The inadequacy and consequent inefficacy of the alleged causes. Dr.T. Dwight.

[Sarah]

Lack of the quantity or quality required.

[Marquetta]

the fact that something is not good enough or is too small in amount:

[Renato]

The state or quality of being inadequate; lack of the quantity or quality required.