"sadder" in the adjective sense
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
of things that make you feel sad
"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
"my finances were in a deplorable state"
"a lamentable decision"
"her clothes were in sad shape"
"a sorry state of affairs"
Source: WordNet® (An amazing lexical database of English)
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