adj .
full of doubt ; uncertain 의심하는 ; 확신하지 못하는

• I was fairly certain hat I would be able to fly if I could merely flap my arms hard enough, but Mary was dubious ; she said I'd better flap my legs as well.
• We were dubious about the team's chance of success and, as it turned out, our dubiety was justified : the team lost.
• Dubious and doubtful don't mean same thing. A dubious person is a person who has doubts. A doubtful outcome is an outcome that isn't certain to occur.
• Sam's chances of getting the job were doubtful, because the employer was dubious of his claim that he had been president of the United Sates while in high school.
• Something beyond doubt is indubitable. A dogmatic person believes his opinions are indubitable.
  의심할 나위 없이 분명하다는 뜻이 indubitable 이다. 독단적인 사람은 자신의 견해가 의심할 나위 없이 확실하다고 믿는다.