The Collaborative International Dictionary of English v.0.48:

Sophomoric \Soph`o*mor"ic\, Sophomorical \Soph`o*mor"ic*al\, a.
   Of or pertaining to a sophomore; resembling a sophomore;
   hence, pretentious; inflated in style or manner; as,
   sophomoric affectation. [U. S.]
   [1913 Webster]
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "sophomoric":
   amateur, amateurish, autodidactic, bookish, college-bred,
   collegiate, dabbling, dilettante, dilettantish, graduate,
   half-assed, half-baked, half-cocked, immature, learned,
   postgraduate, schoolboyish, schoolgirlish, sciolistic, shallow,
   smattering, studentlike, studious, superficial, undergraduate