This is the 545th most frequent Icelandic word.
nánast
"Almost" or "nearly."
In this sentence, 'nánast' means 'almost' and is used to convey a degree of uncertainty or approximation.
Ég er nánast viss um að þetta er rétt.
I am almost certain that this is correct.
Here, 'nánast' emphasizes the extent of incredulity about the short time taken.
Hún kláraði verkefnið á nánast ótrúlega stuttum tíma.
She completed the project in an almost incredibly short time.
In this context, 'nánast' introduces a comparison or a scenario that is close to being factual.