žarki

1. (of a color) bright; vivid
   Kupila je haljinu žarkocrvene boje. — She bought a bright red dress.
2. (of the sun, weather) scorching; hot
   Ne sedi dugo na žarkom suncu. — Don't sit in the scorching sun for too long.
3. (of feelings, wishes) ardent; passionate; fervent
   Njegova žarka želja je da putuje po svetu. — His fervent wish is to travel the world.

With color adjectives it is usually written as one word: žarkocrven, žarkozelen.