Source : Webster's Revised Unabridged Dictionary (1913)

Imaginative \Im*ag"i*na*tive\, a. [F. imaginatif.]
   1. Proceeding from, and characterized by, the imagination,
      generally in the highest sense of the word.

            In all the higher departments of imaginative art,
            nature still constitutes an important element.
                                                  --Mure.

   2. Given to imagining; full of images, fancies, etc.; having
      a quick imagination; conceptive; creative.

            Milton had a highly imaginative, Cowley a very
            fanciful mind.                        --Coleridge.

   3. Unreasonably suspicious; jealous. [Obs.] --Chaucer. --
      {Im*ag"i*na*tive*ly}, adv. -- {Im*ag"i*na*tive*ness}, n.

Source : WordNet®

imaginatively
     adv : with imagination; "the room was decorated very
           imaginatively" [ant: {unimaginatively}]