Insufficiency
Part of speech: noun
Definition: The lack of sufficiency; the shortage or inadequacy of.
Inadequacy
Part of speech: noun
Definition: the state of being inadequatea shortage of required materiala lack of competence or ability
Example sentence: In thinking about male identities, I'm struck by the inadequacy of the terms we use. The notion that men should be distant, domineering and self-seeking is often described as toxic masculinity, but this serves only to alienate those who might need most help.