žalosno

1. sadly; mournfully
   Pas me je žalosno pogledao. — The dog looked at me sadly.
2. (žalosno je) it's sad; it's pathetic
   Žalosno je što niko nije došao. — It's sad that nobody came.
   Žalosno je kako se ponašaju prema starima. — It's pathetic how they treat old people.