The opposite of sorrowful would be joyful (happy).
Depressed, unhappy, sorrowful, sad...
The opposite of optimistic is pessimistic.Pessimistic, dejected, sorrowful, doubtful, gloomy, hopeless...
The opposite of being glad is often being sorry or sad. In some uses, the proper adjective can be sorrowful.
sorrowful
The word 'sorrowful' is not a noun. The word 'sorrowful' is the adjective form for the noun sorrow. The noun form for the adjective sorrowful is sorrowfulness.
Sorrowful Angels was created in 1999.
The duration of The Sorrowful Shore is 1020.0 seconds.
Second Sorrowful Mystery - The Scourging at the Pillar
The duration of Sorrowful Jones is 1.47 hours.
The Sorrowful Shore was created on 1913-07-05.
Sorrowful Jones was created on 1949-06-05.