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):

considerate
    adj 1: showing concern for the rights and feelings of others;
           "friends considerate enough to leave us alone" [ant:
           inconsiderate]

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "considerate":
   accommodating, accommodative, affable, agreeable, amiable,
   attentive, benevolent, big, calculating, careful, cautious,
   charitable, chary, chivalrous, circumspect, civil, compassionate,
   complaisant, courteous, curious, deferential, delicate, discreet,
   discriminating, discriminative, enlightened, fair, friendly,
   generous, gingerly, good-hearted, graceful, gracious, greathearted,
   guarded, heedful, helpful, indulgent, judgmatic, judicial,
   judicious, kind, kindly, lenient, lofty, loving, magnanimous,
   mindful, mindful of others, obliging, polite, politic, provident,
   prudent, prudential, reflecting, reflective, regardful, respectful,
   safe, sensitive, solicitous, sympathetic, tactful, tender,
   thoughtful, tolerant, unselfish, urbane, warmhearted, wary,
   well-advised, well-judged