The adj sad has 3 senses (first 1 from tagged texts)
1. (9) sad -- (experiencing or showing sorrow or unhappiness; "feeling sad because his dog had died"; "Better by far that you should forget and smile / Than that you should remember and be sad"- Christina Rossetti)
2. sad -- (of things that make you feel sad; "sad news"; "she doesn't like sad movies"; "it was a very sad story"; "When I am dead, my dearest, / Sing no sad songs for me"- Christina Rossetti)
3. 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")