The Collaborative International Dictionary of English v.0.48:

Nostalgic \Nos*tal"gic\, a. [Cf. F. nostalgique.]
   Of or pertaining to nostalgia; affected with nostalgia.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nostalgic
    adj 1: unhappy about being away and longing for familiar things
           or persons

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "nostalgic":
   bathetic, beery, cloying, gooey, gushing, hankering, homesick,
   honing, languishing, longing, maudlin, mawkish, mushy, namby-pamby,
   nostomanic, oversentimental, oversentimentalized, pining, romantic,
   sappy, sentimental, sentimentalized, sloppy, soft, sticky,
   tear-jerking, teary, wishful, wistful, yearnful, yearning