Source : Webster's Revised Unabridged Dictionary (1913)

Adequateness \Ad"e*quate*ness\, n.
   The quality of being adequate; suitableness; sufficiency;
   adequacy.

Source : WordNet®

adequateness
     n : the quality of being able to meet a need satisfactorily: "he
         questioned the adequacy of the usual sentimental
         interpretation of the Golden Rule" [syn: {adequacy}]
         [ant: {inadequacy}]