1 unlikely or uncertain 不大可能;不确定:
It's doubtful whether/if we'll finish in time.我们能否按时完成还不一定。It was doubtful that he was still alive.他不大可能仍在人世了。
2doubtful (about sth/about doing sth) (used about a person) not sure (指人)不能肯定:
He still felt doubtful about his decision.自己的决定是对的还是不对的,他还拿不准。 ➔doubtfully /-fəli ||; -fəlɪ/ adv‘I suppose it'll be all right,’ she said doubtfully. 她将信将疑地说﹕“我想不会有事吧。”
doubtful/ˋdaUtfəl; ˈdaʊtf$l/adj 1 probably not true, or unlikely to happen 未必是真的﹔不大可能的: it is doubtful if/whether It is doubtful whether she will survive. 很难说她能否活下来。2 not certain about something 不确定的: +if/whether I’m still doubtful if I should take the job. 我还不确定我是否应该接受这份工作。 —doubtfully adv