Definitions of Utopian:

• noun:   an idealistic (but usually impractical) social reformer

  Example: "A Utopian believes in the ultimate perfectibility of man"

• adjective:   characterized by or aspiring to impracticable perfection

  Example: "The dim utopian future"

• adjective:   of or pertaining to or resembling a utopia

  Example: "A Utopian novel"