suspicious：可疑的,有蹊跷的
例：There were suspicious circumstances about his death.
incredible：不能相信的,不可信的例：The plot of the book is incredible.doubtful:可疑的,疑惑的例：I'm doubtful whether she's still alive.unbeliving：不相信的;怀疑的例：She looked unbelieving.如果你是在做选词填空练习题,我很希望 你能 写那个句子 出来,然后做出一个你满意的 Answer!