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Describes behavior or a situation that is not just, violates the rules, or puts someone at an unjustified disadvantage.
Es ist unfair, dass ich die ganze Arbeit alleine machen muss.
It's unfair that I have to do all the work by myself.
'Unfair' is simply structured: it consists of the negative prefix 'un-' and the word 'fair'. So it literally means 'not fair'.
Die Regeln sind für alle gleich, da ist nichts unfair.
The rules are the same for everyone; there's nothing unfair about that.
To express toward whom the behavior is unfair, German uses the preposition 'gegenüber' (toward) with the dative. The preposition can come before or after the noun or pronoun.
Sein Verhalten war den neuen Kollegen gegenüber sehr unfair.
His behavior toward the new colleagues was very unfair.
'Unfair' is very often used in sentences that begin with 'Es ist unfair,...' (It is unfair,...). This is followed either by a subordinate clause with 'dass' (that) or an infinitive construction with 'zu' (to).
Ich finde es unfair, ihm die ganze Schuld zu geben.
I think it's unfair to put all the blame on him.
clean
'sauber' and 'unfair' can both evaluate people's behavior. In this context, 'sauber' means that someone acts honestly and fairly. 'unfair' is the opposite: someone breaks rules or treats others unjustly. 'sauber' fits especially well when you want to emphasize that something was done correctly and without tricks. 'unfair' is used when someone gets an advantage or harms others even though it is not just.
Es war unfair, dass mein Kollege die ganze Arbeit mir gegeben hat.
It was unfair that my colleague gave all the work to me.
Die Mannschaft hat sauber gespielt und den Sieg verdient.
The team played cleanly and deserved the win.