"inadequacy" in the noun sense
1. insufficiency, inadequacy, deficiency
lack of an adequate quantity or number
"the inadequacy of unemployment benefits"
2. insufficiency, inadequacy
a lack of competence
"pointed out the insufficiencies in my report"
"juvenile offenses often reflect an inadequacy in the parents"
3. inadequacy, inadequateness
unsatisfactoriness by virtue of being inadequate
Source: WordNet® (An amazing lexical database of English)
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