This is the 781st most frequent Icelandic word.
talsvert
"Considerably" or "significantly."
The word 'talsvert' here quantifies the amount of people, indicating a considerable amount.
Það var talsvert af fólki á fundinum.
There was quite a lot of people at the meeting.
In this sentence, 'talsvert' modifies the adjective 'góða', enhancing the degree of goodness.
Hún hefur talsvert góða innsýn í málið.
She has quite a good insight into the matter.
Here, 'talsvert' quantifies the verb 'unnið', showing a significant level of work accomplished.