adj. 难以预测的;难以预料的,未定局的;怀疑的,拿不准的;不明不白
网络 怀疑的; 可疑的; 怀疑的,可疑的
We were doubtful about the practicability of the plan.
我们怀疑这个计划是否切实可行。
Ecologists argue that the benefits of treating sewage with disinfectants are doubtful.
生态学家们认为用消毒剂处理污水的好处是值得怀疑的。
That in itself was doubtful.
那本身就令人怀疑。
He holds a doubtful attitude towards the latest findings.
他对最新的研究发现持怀疑态度。
When he weeded out "the most doubtful measures of aggression", only 28% supported a connection.
当他排除“最可疑的攻击手段”时,只有28%的人支持这种联系。