inadequacy

nouns

lack of an adequate quantity or number
"the inadequacy of unemployment benefits"
deficiency, inadequacy, insufficiency
antonym
adequacy
a lack of competence
"pointed out the insufficiencies in my report"; "juvenile offenses often reflect an inadequacy in the parents"
inadequacy, insufficiency
unsatisfactoriness by virtue of being inadequate
inadequacy, inadequateness
antonym
adequacy