WordWeb Online

1. Experiencing or marked by or expressing sorrow especially that associated with irreparable loss
   "sorrowful widows"; "a sorrowful tale of death and despair"; "sorrowful news"; "even in laughter the heart is sorrowful"

See also: anguished, bereaved, bereft, bitter, brokenhearted, dolorous, dolourous [Brit, non-standard], elegiac, elegiacal, grief-stricken, grieving, grievous, heartbreaking, heartbroken, heartrending, heartsick, joyless, lachrymose, lamenting, lugubrious, mournful, mourning, plaintive, sad, sorrowing, tearful, tormented, tortured, unhappy, wailful, wailing, weeping, woebegone, woeful

Antonym: joyful