A Japanese friend that works as a teacher told me he wants to quit his job and come to work in Europe. I asked why and he answered:
What is the meaning of ブラック in this sentence? I understand it has a negative connotation, but what does it imply actually? Is the job of teacher not respected in Japanese society? I spent one year in Japan and it didn't look like it to me. Does he mean that the job is tiring or underpaid?
In general, what is the meaning of ブラック when it does not refer to the color? Thank you for your help!