problem

1 something that requires thought and skill for resolution the problem of world hunger Synonyms case, challenge, knot, matter, nut, trouble Related Words issue, question; corner, fix, hole, hot water, jam, mire, pickle, predicament, quagmire, spot; crux, Gordian knot, sticky wicket, toughie (also toughy); catch-22, dilemma, quandary; catch, glitch, hitch, pitfall, snag; conundrum, enigma, mystery, puzzle, puzzlement, riddle; brainteaser, perplexer, poser, stumper Near Antonyms magic bullet, silver bullet; cure-all, panacea Antonyms answer, solution

2 an interrogative expression often used to test knowledge there were only 10 problems on the exam, but they were all challenging Synonyms interrogative, questionRelated Words brainteaser, conundrum, poser, puzzle, quiz, riddle, stickler, stumper, toughie (also toughy)Near Antonyms answer, response, solution