Something that is damaging to your motivation. Suppose you work really hard to English for years and you get a new teacher who says: "You have a terrible ear for languages, you will never learn English". That would be soul-crushing. I hope that helps.

Hi! It means that something is devastating, depressing, "brutally sad". I hope it helped!

Hi Yoko, it means you are so disappointed, your soul is destroyed. For example: He had an accident. It's so soul crushing to watch him there, lying in hospital.

Very disappointing or saddening.