1) Amount 2) Deficiency 3) Failing 4) Fault 5) Insufficiency 6) Limitation 7) Something inadequate 8) Weakness 1) Deficit 2) Exiguity 3) Imperfection 4) Inadequateness 5) Incompetence 6) Insufficiency 7) Inutility 8) Meagerness 9) Meagreness 10) Scantiness 11) Scantness 12) Scarceness 13) Scarcity 14) Shortage 15) Shortfall 16) Weakness 
• (n.) The quality or state of being inadequate or insufficient; defectiveness; insufficiency; inadequateness.
In·ad'e·qua·cy noun [ From Inadequate .] The quality or state of being inadequate or insufficient; defectiveness; insufficiency; inadequateness. « The inadequacy and consequent inefficacy of the alleged causes.» Dr. T. Dwight. 
[n] - unsatisfactoriness by virtue of being inadequate
inadequacy 1. A lack of an adequate quantity or number. 2. A lack of competence; insufficiency.
noun a lack of competence; `pointed out the insufficiencies in my report`; `juvenile offenses often reflect an inadequacy in the parents`inadequateness noun unsatisfactoriness by virtue of being inadequate
the state or condition of being inadequate; insufficiency. · something inadequate; defect: The plan has many inadequacies.
Inadequacy refers to the lack of production capacity or insufficient production capacity of a company?s current assets to meet its current or future production demands. In other words, growing manufacturers reach a point where their current equipment can?t produce enough to meet the growing demand of their productions. These manufacturers need to c...