doubt·ful/`datfəl; ˈdaʊtfəl/ adj 1 unlikely to happen 不大可能的: + that It's doubtful that we'll go abroad this year. 今年我们不大可能去国外了。 2 not certain about something 不确定的: Jules looked doubtful about the suggestion. 朱尔斯对这一建议似乎心存疑虑。 3 unlikely to be true 令人生疑的: a doubtful claim 让人怀疑的说法