The Collaborative International Dictionary of English v.0.48:

Agreeably \A*gree"a*bly\, adv.
   1. In an agreeably manner; in a manner to give pleasure;
      pleasingly. "Agreeably entertained." --Goldsmith.
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   2. In accordance; suitably; consistently; conformably; --
      followed by to and rarely by with. See Agreeable, 4.
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            The effect of which is, that marriages grow less
            frequent, agreeably to the maxim above laid down.
                                                  --Paley.
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   3. Alike; similarly. [Obs.]
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            Both clad in shepherds' weeds agreeably. --Spenser.
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WordNet (r) 3.0 (2006):

agreeably
    adv 1: in an enjoyable manner; "we spent a pleasantly lazy
           afternoon" [syn: pleasantly, agreeably, enjoyably]
           [ant: disagreeably, unpleasantly]