What Does The Phrase “hard Luck” Mean

What does the phrase “hard luck” mean?

What idiom describes a hopeless situation?

Desperation is the attitude of seeing no hope in (something). I gave up hope that grandma would ever get better after learning her grim diagnosis.

What is the idiom for something extremely challenging?

The going is difficult (quite / somewhat). It is virtually impossible. The course requires a lot of work. On occasion, the course can be taxing. It can be very difficult at times. It’s (quite / a little) difficult going. Near-impossible, really.