baksuz

1. colloq. (of a person) unlucky person; jinx
   Ja sam pravi baksuz, uvek mi se nešto desi. — I'm so unlucky, something always happens to me.
   Ne vodi ga na utakmicu, on je baksuz. — Don't take him to the match, he's a jinx.
2. colloq. bad luck
   Kakav baksuz, opet mi je pobegao autobus! — What bad luck, I missed the bus again!
3. colloq. derog. (of a person) grouch; disagreeable person
   Ne budi baksuz, dođi s nama na slavlje! — Don't be such a grouch, come to the party with us!

The adjective is baksuzan "unlucky": baksuzan dan.