žedneti

1. to be thirsty; to get thirsty
   Po ovoj vrućini stalno žednim. — In this heat I'm thirsty all the time.
   Biljke žedne jer mesec dana nije padala kiša. — The plants are thirsty because it hasn't rained for a month.
2. formal (+ za + instr.) to thirst for; to crave
   Narod žedni za pravdom. — The people thirst for justice.

In the sense 'to crave' it takes za + instrumental (za znanjem, za pravdom).