If it is doubtful that something will happen, it seems unlikely to happen or you are uncertain whether it will happen. 不大可能的
adjective [原级] 怀疑的，不确定的；未必的，不大可能的；不可靠的
We were doubtful about the practicability of the plan. 我们怀疑这个计划是否切实可行。
- doubtful 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 45 The power of the press
来自doubt(v. 怀疑)
- 网友用 “Doubtful” 造句精选
- ...selling something that is overpriced or of doubtful quality. …销售价格过高或质量有问题的东西。
- Rose was doubtful about the whole idea. 罗斯对整个设想持怀疑态度。
- For a time it seemed doubtful that he would move at all. 短期内他似乎不大可能搬走。
- Forsyth is doubtful for tonight's game with a badly bruised leg. 福赛斯因为严重的腿伤不太可能参加今晚的比赛。
- I was still very doubtful about the chances for success. 我仍然不能肯定成功的可能性有多大。
- This wine is of doubtful quality. 这酒的质量有问题。