hell
The word 'inferno' is used in Italian to describe a place of suffering and torment, similar to the English word 'hell'. It can also be used metaphorically to describe a very difficult or unpleasant situation.
I would never want to end up in hell.
The phrase is expressing a personal sentiment or fear of ending up in the disagreeable or unpleasant circumstance symbolised as 'hell' or 'inferno'.
This room is a hell, open the window.
In this sentence, the term 'inferno' is used metaphorically to imply extremely uncomfortable conditions, specifically to describe a room that's too hot or stuffy.
Laura says that Mondays at work are hell.
Here 'inferno' is used idiomatically to convey a strong negative sentiment towards a particular aspect of life, in this case, Mondays at work.