This is the 978th most frequent Icelandic word.
alvarlega
"Alvarlega" means "seriously" in English.
Here, 'alvarlega' means 'seriously', indicating the manner in which I approach the job.
Ég tek þessa vinnu alvarlega.
I take this job seriously.
In this sentence, 'alvarlega' describes the nature of the discussion, stressing its seriousness.
Við þurfum að ræða þetta mál alvarlega.
We need to discuss this issue seriously.
'Alvarlega' modifies 'complaint', conveying the severity of the issue.