Don't know if this is the right place to ask this because is not a translations per se is more like a doubt that I have.
What's the difference between 不公平 ,不当, 不正, all of them mean the same thing right? Injustice, unfair, etc. What I don't get is that the dictionary says N3 and N1, does it mean that you use 不当 if you are older and 不正 if you are a younger person? what about 不公平 that doesn't say anything... btw I use zkanji as a dictionary