This is the 572nd most frequent Slovenian word.
izredno
Exceptionally; extremely; extraordinarily.
Here, 'izredno' is used as an adverb to emphasize the level of difficulty, translating to 'extremely'.
To je bila izredno zahtevna naloga.
This was an extremely challenging task.
In this sentence, 'izredno' is used as an adjective describing 'knowledge,' meaning 'exceptional'.
Profesor je pohvalil njeno izredno znanje matematike.
The professor praised her exceptional knowledge of mathematics.
Here, 'izrednih' is a form of 'izredno' acting as an adjective to modify 'razmer,' meaning 'emergency' or 'extraordinary'.