takmičarski

1. competitive; competition
   On ima jak takmičarski duh. — He has a strong competitive spirit.
   Nova takmičarska sezona počinje u septembru. — The new competition season starts in September.

2. competitively
   Ona se takmičarski bavi plivanjem od desete godine. — She has been swimming competitively since she was ten.

A "competitive price" is konkurentna cena in Serbian, not takmičarska.