- any question or matter involving doubt, uncertainty, or difficulty.
- a question proposed for solution or discussion.
- a statement requiring a solution, usually by means of a mathematical operation or geometric construction.
- difficult to train or guide; unruly: a problem child.
- dealing with choices of action difficult either for an individual or for society at large: a problem play.
- no problem, Informal.
- (used as a conventional reply to a request or to express confirmation or affirmation): Sure, no problem, I can do that right away.
- (used as a conventional reply to an expression of gratitude or thanks): No problem, I’m glad I could help!
- any thing, matter, person, etc, that is difficult to deal with, solve, or overcome
- (as modifier)
- a puzzle, question, etc, set for solution
- a statement requiring a solution usually by means of one or more operations or geometric constructions
- designating a literary work that deals with difficult moral questions
