regretful, sorry, bad -- (feeling or expressing regret or sorrow or a sense of loss over something done or undone; "felt regretful over his vanished youth"; "regretful over mistakes she had made"; "he felt bad about breaking the vase")
deplorable, distressing, lamentable, pitiful, sad, sorry -- (bad; unfortunate; "my finances were in a deplorable state"; "a lamentable decision"; "her clothes were in sad shape"; "a sorry state of affairs")
blue, dark, dingy, disconsolate, dismal, gloomy, grim, sorry, drab, drear, dreary -- (causing dejection; "a blue day"; "the dark days of the war"; "a week of rainy depressing weather"; "a disconsolate winter landscape"; "the first dismal dispiriting days of November"; "a dark gloomy day"; "grim rainy weather")