trivialize

from WordNet (r) 3.0 (2006)

trivialize
    v 1: make trivial or insignificant; "Don't trivialize the
         seriousness of the issue!" [syn: {trivialize},
         {trivialise}]

from Moby Thesaurus II by Grady Ward, 1.0

23 Moby Thesaurus words for "trivialize":
      beggar, belittle, decry, denigrate, deprecate, depreciate, dismiss,
      disparage, lessen, make light of, minimize, misprize, play down,
      pooh-pooh, put down, run down, scoff at, scorn, slight,
      underestimate, underplay, underrate, undervalue