inadequacy

(noun) lack of an adequate quantity or number. Synonyms: insufficiency, deficiency. Example: "The inadequacy of unemployment benefits."

(noun) a lack of competence. Synonyms: insufficiency. Examples: "Pointed out the insufficiencies in my report." "Juvenile offenses often reflect an inadequacy in the parents."

(noun) unsatisfactoriness by virtue of being inadequate. Synonyms: inadequateness.