The Collaborative International Dictionary of English v.0.48:

moralistic \moralistic\ adj.
   1. narrowly and conventionally moral; -- of people.
      [WordNet 1.5]

   2. disposed to moralize[2]; -- of people.

   Syn: moralizing.
        [PJC]

WordNet (r) 3.0 (2006):

moralistic
    adj 1: narrowly and conventionally moral

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "moralistic":
   admonitory, advisory, axiological, cautionary, consultative,
   consultatory, didactic, directive, ethical, ethological,
   exhortative, exhortatory, expostulative, expostulatory, hortative,
   hortatory, instructive, monitorial, monitory, moral, noble,
   preachy, principled, recommendatory, remonstrant, remonstrative,
   remonstratory, right-minded, righteous, sententious, virtuous,
   warning