adj .
full of difficulties ; tough ; painful 어려운 일이 많은 ; 곤란한 ; 괴로운

• A rosebush is literally _____, a problem may be figuratively so.
  장미는 문자 그대로 가시가 많다. 곤란한 문제는 비유적인 뜻에서 그럴 것이다.
• Before we go any further, we'll have to resolve the _____ question of who's going to pay for the next round.
• Whether to let children go out along after dark is a _____ topic for the parents of urban teenagers. It is more important to keep them safe at home or to allow them to develop a sense of independence?