This is the 2634th most frequent Swedish word.
rättvist
Fairly; justly.
In this sentence, 'rättvist' functions as an adverb describing how one should treat others.
Det är viktigt att behandla alla rättvist.
It is important to treat everyone fairly.
Here, 'rättvist' is used adjectivally to describe the quality of the decision made.
Ett rättvist beslut har fattats.
A fair decision has been made.
In this context, 'rättvist' acts as an adverb describing the manner in which the judging was attempted.