This is the 370th most frequent Icelandic word.
verulega
Significantly.
Here, 'verulega' is used as an adverb to intensify the level of interest, translating to 'significantly'.
Ég hef verulega áhuga á þessu verkefni.
I am significantly interested in this project.
In this context, 'verulega' describes the extent of the change in weather, also meaning 'significantly'.
Veðrið hefur breyst verulega á síðustu dögum.
The weather has significantly changed in the last few days.
Here, 'verulega' modifies 'mikilvægt' (important) to emphasize the importance of the step, functioning as an intensifier.