žalostan

1. (of a person, face) sad; mournful; downcast
   Zašto si danas tako žalostan? — Why are you so sad today?
   Imala je žalostan pogled. — She had a mournful look.
2. (of an event, news) sad; sorrowful
   Stigla nam je žalosna vest iz bolnice. — We got sad news from the hospital.
3. pathetic; pitiful; deplorable
   Bio je to žalostan pokušaj izvinjenja. — It was a pathetic attempt at an apology.
   Žalosno je što niko nije pomogao. — It's sad that nobody helped.

In everyday speech tužan is more frequent; žalosno je… is a common evaluative phrase.