adjective sadder sad′·der, saddest sad′·dest

1. having, expressing, or showing low spirits or sorrow; unhappy; mournful; sorrowful
2. causing or characterized by dejection, melancholy, or sorrow
3. dark or dull in color; drab
4. Informal very bad; deplorable
5. Dialectal heavy or soggy a sad cake

Etymology: ME < OE sæd, sated, full, hence having feelings assoc. with satiety, akin to Ger satt, sated < IE base *sā-, satisfied, sated > L satis, enough, OIr sāith, satiety