noun
plural -lems
[count] :something that is difficult to deal with :something that is a source of trouble, worry, etc.
We would love to have a dog. The only problem is (that) [=the reason that would be difficult is] we don't have the time to take care of it.
The fact that you're late is not my problem. [=I am not responsible for helping you deal with the problem of being late]
[singular] difficulty in understanding something
a feeling of not liking or wanting to do something
[count] :a mathematical question to be solved
no problem
also not a problem
informal - used to say that you are happy to do something or that you are not bothered by something
adjective
always used before a noun
difficult to deal with