
unfair
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.
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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.
sneaky / left
Link and unfair can describe behavior that harms others or violates fair treatment. Link additionally suggests that someone is acting in a sneaky or dishonest way; unfair focuses mainly on the unjust disadvantage or violation of a rule. Use link when deception is involved and unfair when justice is lacking.

Es war unfair, dass nur eine Gruppe den ganzen Nachteil tragen musste.
It was unfair that only one group was left to bear the entire disadvantage.
Es war link, dass der Spieler die Regel heimlich ausnutzte.
It was sneaky of the player to exploit the rule secretly.