- It’s quite good. It’s quite impossible.
Good is a ‘gradable’ adjective: things can be more or less good. Impossible is not ‘gradable’. Things cannot be more or less impossible; they are impossible or they are not.
With gradable adjectives, quite means something like ‘fairly’ or ‘rather’.
- ‘How’s your steak?’ Quite nice ‘
She’s quite pretty. She’d look better if she dressed differently, though.
With non-gradable adjectives, quite means ‘completely’.
- His French is quite perfect. The bird was quite dead.
- quite a nice day quite an interesting film
- I quite like her. Have you quite finished?