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