This is the 3605th most frequent Swedish word.
frisk
Healthy.
In this case, 'frisk' is used as an adjective to describe someone's physical state of being healthy.
Hon känner sig frisk efter sjukdomen.
She feels healthy after the illness.
Here, 'frisk' is used to describe the quality of the air, meaning it has a freshness or purity.
Luften är frisk och klar på morgonen.
The air is fresh and clear in the morning.
In this example, 'frisk' is metaphorically used to describe someone's approach or attitude as being fresh and invigorating.