adequacy

Noun

• the quality of being sufficient for the end in view
  • he questioned the sufficiency of human intelligence
    

• the quality of being able to meet a need satisfactorily: "he questioned the adequacy of the usual sentimental interpretation of the Golden Rule"

Related words

• Synonyms: 
  sufficiency , adequateness
• Antonyms: 
  insufficiency , inadequacy , deficiency , inadequateness