any question or matter involving doubt, uncertainty, or difficulty.

a question proposed for solution or discussion.

Mathematics . a statement requiring a solution, usually by means of a mathematical operation or geometric construction.

difficult to train or guide; unruly

a problem child.

Literature . dealing with choices of action difficult either for an individual or for society at large

a problem play.

no problem, (used as a conventional reply to a request or to express confirmation, affirmation

or gratitude).

noun

good situation , solution

noun

botheration , box * , can of worms * , complication , count * , crunch * , dilemma , disagreement , dispute , disputed point , doubt , headache * , hitch * , hot water , issue , mess * , obstacle , pickle * , point at issue , predicament , quandary , question , scrape * , squeeze * , trouble , worriment , brainteaser , bugaboo * , cliff-hanger , conundrum , enigma , example , grabber , illustration , intricacy , mind-boggler , mystery , poser * , puzzler , query , riddle , sixty-four thousand dollar question , stickler , stumper , teaser , twister , hornets\' nest , bugbear , difficulty , hitch , hydra , imbroglio , knot , labyrinth , morass , perplexity , plight , poser , proposition , puzzle , quagmire , situation , snag , sum , syndrome , unmanageable