adj .
strict ; harsh ; severe 엄격한 ; 거친 ; 혹독한

• To be rigorous is to act with rigor.
  to be rigorous 는 엄격하게 행동하는 것이다.
• Our exercise program was rigorous but effective ; after just a few months, our eighteen hours of daily exercise had begun to pay off.
  우리의 훈련 프로그램은 혹독하긴 했지만 효과는 있었다 ; 겨우 몇 달 지나지 않아서 하루에 열 여덟 시간씩의 훈련은 그 성과가 나타나기 시작했다.
• The professor was popular largely because he wasn't very rigorous ; there were no tests in his course and only one paper, which was optional.