This is the 6803rd most frequent Polish word.
fatalna
"Fatalna" means "terrible" or "awful" in English.
The word 'fatalna' here is used to describe something very bad or detrimental, emphasizing the severity of the mistake.
To była fatalna pomyłka.
It was a disastrous mistake.
In this context, 'fatalna' characterizes the poor quality of the movie, expressing a strong negative opinion.
Film, który widzieliśmy w zeszły weekend, był naprawdę fatalny.
The movie we saw last weekend was truly awful.
Here, 'fatalna' is used in its negative form ('nie wygląda fatalnie'), suggesting that the weather forecast is not terrible or very bad.