starless
A starless night
safe
The meat is safe for eating
no problem;  nothing's the matter;  there's nothing the matter;  there's nothing wrong
What's wrong with your moto ? -  No problem !;  Nothing's the matter (with it) !;  There's nothing wrong (with it) !
You cough too much.  What's wrong with you? -  No problem !;  Nothing's the matter (with me) !;  There's nothing wrong (with me) !
OK;  all right
Don't worry, there's nothing wrong with your blood pressure;  Don't worry,  your blood pressure is all right!
She's had a traffic accident, but she's all right
You look very pale.  Are you all right/OK?
Don't worry about me, I'm OK/all right
cannot do something
I have consulted many dictionaries,  but I cannot understand this idiom