This is the 2016th most frequent Swedish word.
tuffaste
"Tuffaste" means "toughest" in English.
Here, 'tuffaste' is used in its superlative form to describe the intensity or difficulty of the competition.
Det var den tuffaste tävlingen jag någonsin har deltagit i.
It was the toughest competition I have ever participated in.
In this case, 'tuffaste' describes someone's strong character or resilience, again in its superlative form.
Hon är den tuffaste personen jag känner.
She is the toughest person I know.
Sometimes, 'tuffaste' is colloquially used to mean 'coolest,' demonstrating a fashionable or bold choice in this context.