Synonyms for Depreciatory (same or very similar meaning)
WordNet sense 1 (tending to decrease or cause a decrease in value):
depreciating, depreciativeWordNet sense 2 (becoming less or smaller):
decreasingWordNet sense 3 (tending to diminish or disparage):
deprecating, deprecatory, slighting, belittling, deprecativeWordNet sense 4 (tending to (or intended to) detract or disparage):
uncomplimentaryFrom the ODE community, based on WordNetadd/edit