conundrum

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++co·nun·drum /kəˈnʌndrəm/ noun [countable]  1  PROBLEMa confusing and difficult problem 难题，复杂难解的问题 the conundrum of our purpose on Earth 我们为何目的活在世上这一难题2. JOKEa trick question asked for fun 智力谜语 SYN riddle

Examples from the Corpus

conundrum• Skymaster is stuck in a conundrum that affects a lot of electronic information services.• This is partly a humid, faintly Graham Greene-like love story, partly a conundrum about opaque and enigmatic behaviour.• King remains a conundrum, a man of both major strengths and serious character flaws.• This is not merely a curious conundrum.• The administration is facing a familiar conundrum.• It was the moral conundrum that defined our home.• This broader problem touched on such philosophical conundrums as who we are and what our place is in the universe.• The divine drama illuminated for us by the Holy Spirit disintegrates into puzzles, conundrums and endless interpretations.• So far he had found no way to resolve the conundrum facing him.

co·nun·drum nounChineseSyllable  

and difficult confusing problem a Corpus

conundrum
co‧nun‧drum /kəˈnʌndrəm/ noun [countable]
1. a confusing and difficult problem:
    the conundrum of our purpose on Earth
2. a trick question asked for fun
   SYN  riddle

con·un·drumBrE /kəˈnʌndrəm/ 🔊NAmE /kəˈnʌndrəm/ 🔊 nouna confusing problem or question that is very difficult to solve 令人迷惑的难题；复杂难解的问题a question, usually involving a trick with words, that you ask for fun 谜语 SYN riddle