Synonyms for Depressing (same or very similar meaning)
WordNet sense 1 (causing or suggestive of sorrow or gloom):
depressive, gloomy, saddeningWordNet sense 2 (experiencing or showing sorrow or unhappiness):
sadWordNet sense 3 (causing dejection):
blue, dark, dingy, disconsolate, dismal, drab, drear, dreary, grim, sorry, dispiriting, dingyWordNet sense 4 (lacking cheer; depressing):
cheerless, uncheerfulFrom the ODE community, based on WordNetadd/edit