The Collaborative International Dictionary of English v.0.48:

Unpractical \Un*prac"ti*cal\, a.
   Not practical; impractical. "Unpractical questions." --H.
   James.
   [1913 Webster]

         I like him none the less for being unpractical.
                                                  --Lowell.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "unpractical":
   airy, autistic, dereistic, idealistic, impractical, in the clouds,
   nonrealistic, otherworldly, poetic, quixotic, romancing, romantic,
   romanticized, starry-eyed, storybook, transcendental, transmundane,
   unrealistic, visionary, wish-fulfilling