From The Collaborative International Dictionary of English v.0.48 :
Adequateness \Ad"e*quate*ness\, n.
The quality of being adequate; suitableness; sufficiency;
adequacy.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
adequateness
n 1: 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,
adequateness] [ant: inadequacy, inadequateness]