单词：doubtfulnesses
n.
doubtful的变形
doubtful
['dautful]
adj.
不大可能的，未必的
可(怀)疑的，令人生疑的，使人产生疑问的
怀疑的，疑惑的，拿不准的，不确定的，无把握的(about， of)
(观点、信念、意见等方面)不定的，未定的，未(解)决的；(结果如何)难以预测的，难料的
含糊(不清)的，暧昧的，模棱两可的，不明确的
(名声、品德、价值、诚实性、有效性等)有问题的，不太好的，坏的，不可靠的，可疑的
犹豫不决的，迟疑的，有疑虑的，有保留的
[古语]令人忧虑的；危险的
近义词:
dubious
. questionable
. problematical
反义词:
certain
. sure
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