intenzivan

1. intense; strong; vivid
   Osetio je intenzivan bol u leđima. — He felt an intense pain in his back.
   Volim intenzivne boje na zidovima. — I like vivid colours on the walls.
2. (of work, training, care) intensive
   Upisala sam intenzivan kurs srpskog jezika. — I signed up for an intensive Serbian course.
   Pacijent je još na intenzivnoj nezi. — The patient is still in intensive care.

Intenzivna nega is intensive care (the medical treatment); odeljenje intenzivne nege is the intensive care unit.