This is the 2475th most frequent Swedish word.
intensiv
Intensiv (Swedish): Intense; marked by extreme effort, strength, or focus.
Here 'intensiv' describes a demanding and focused work environment.
Jag hade en intensiv arbetsdag.
I had an intense workday.
In this sentence, 'intensiv' refers to the challenging nature of the course which required attention and effort.
Kursen var mycket intensiv, men jag lärde mig mycket.
The course was very intense, but I learned a lot.
Here, 'intensiv' signifies the passionate and possibly heated nature of the discussion.