doubtfulKK [ˋdaʊtfəl] /ˈdaʊtfəl/發音形容詞1懷疑的、不確定的、沒把握的She looked doubtful when I explained my plan to her.我向她說明計畫時,她一臉懷疑。2難說的、不太可能的、未定的It is doubtful whether the team can finish the project on time.這個團隊能否如期完成專案還很難說。3可疑的、有問題的The painting turned out to be of doubtful origin.那幅畫的來源後來證明相當可疑。4不可靠的、堪憂的The company sells cheap tools of doubtful quality.那家公司賣的廉價工具品質堪憂。