Meaning : The quality of being able to meet a need satisfactorily:.
Example :
He questioned the adequacy of the usual sentimental interpretation of the Golden Rule.
Synonyms : adequateness
Meaning : The quality of being sufficient for the end in view.
Example :
He questioned the sufficiency of human intelligence.
Synonyms : sufficiency
Lack of an adequate quantity or number.
The inadequacy of unemployment benefits.