problem

A question to be considered, solved, or answered.

A situation, matter, or person that is hard to deal with or understand.

A personal matter that causes one difficulty or needs to be dealt with.

A misgiving, objection, or complaint.

Difficult to deal with or control.

Dealing with a moral or social problem.

(no problem) Used to express confirmation of or compliance with a request.

(no problem) Used to acknowledge an expression of gratitude.

A question proposed for decision or discussion; a matter for examination; any question involving doubt, uncertainty, or difficulty; also, a question with a discussion of it.