prazno

1. (of a look) blankly; vacantly
   Sedeo je i prazno gledao kroz prozor. — He sat staring blankly out of the window.
   Samo me je prazno pogledala i ćutala. — She just gave me a blank look and said nothing.
2. (with biti, osećati se) empty
   U stanu je bilo prazno i tiho. — The flat was empty and quiet.
   Posle rastanka osećam se prazno. — I've felt empty since the breakup.

In the sense 'empty' it is usually used with biti: prazno je, bilo je prazno.