doubtful
美 ['daʊtfəl] 
英 ['daʊtf(ə)l] 
- adj.怀疑;拿不定主意;不确定;未必
 - 网络怀疑的;可疑的;怀疑的,可疑的
 
doubtful
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1.  | 拿不定主意;不确定;怀疑not sure; uncertain and feeling doubt  | 
Rose was doubtful about the whole idea. 罗斯对整个设想持怀疑态度。  | |
He was doubtful about accepting extra work. 他拿不定主意是否接受额外工作。  | 
2.  | 未必;难说;不大可能unlikely; not probable  | 
It's doubtful if this painting is a Picasso. 这未必就是毕加索的画。  | |
With her injuries it's doubtful that she'll ever walk again. 她多处受伤,今后能否行走还很难说。  | |
It's doubtful whether the car will last another year. 这辆汽车未必还能用上一年。  | |
He is injured and is doubtful for the game tomorrow(= unlikely to play) . 他受了伤,明天未必能参赛。  | 
3.  | [nubn] 不明朗;悬而未定;可能变糟uncertain and likely to get worse  | 
At the beginning of the war things were looking very doubtful. 战争刚开始时,形势看上去很不明朗。  | 
4.  | [obn] 低劣的;未必是真的;靠不住的of low value; probably not genuine or of a quality that you can rely on  | 
This wine is of doubtful quality. 这酒的质量有问题。  |