This is the 566th most frequent Danish word.
fantastisk
Wonderful; fantastic.
Here, 'fantastisk' is used as an adjective to describe 'præstation' (performance), emphasizing its impressive quality.
Din præstation var helt fantastisk.
Your performance was absolutely fantastic.
Here, 'fantastisk' serves as an evaluative adjective indicating high proficiency in 'at løse komplicerede problemer' (solving complicated problems).
Han er fantastisk til at løse komplicerede problemer.
He is fantastic at solving complicated problems.
In this sentence, 'fantastisk' is again an adjective that highlights the exceptional beauty of the 'udsigt' (view).