The Collaborative International Dictionary of English v.0.48:

considerateness \considerateness\ n.
   kind and considerate regard for others; consideration.

   Syn: consideration, thoughtfulness.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Considerate \Con*sid"er*ate\ (k[o^]n*s[i^]d"[~e]r*[asl]t), a.
   [L. consideratus, p. p.]
   1. Given to consideration or to sober reflection; regardful
      of consequences or circumstances; circumspect; careful;
      esp. careful of the rights, claims, and feelings of
      others.
      [1913 Webster]

            Of dauntless courage and considerate pride.
                                                  --Milton.
      [1913 Webster]

            [AE]neas is patient, considerate, and careful of his
            people.                               --Dryden.
      [1913 Webster]

            The wisest and most considerate men in the world.
                                                  --Sharp.
      [1913 Webster]

   2. Having respect to; regardful. [R.]
      [1913 Webster]

            They may be . . . more considerate of praise. --Dr.
                                                  H. More.

   Syn: Thoughtful; reflective; careful; discreet; prudent;
        deliberate; serious. See Thoughtful. --
        Con*sid"er*ate*ly, adv. -- Con*sid"er*ate*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

considerateness
    n 1: kind and considerate regard for others; "he showed no
         consideration for her feelings" [syn: consideration,
         considerateness, thoughtfulness] [ant:
         inconsiderateness, inconsideration, thoughtlessness]