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TOEFL IELTS BNC: 4664 COCA: 9015
doubtful
dtfʊl ˈdaʊtfəl
1 ADJ-GRADED [usually verb-link ADJ] 未必的;不大可能的 If it is doubtful that something will happen, it seems unlikely to happen or you are uncertain whether it will happen. 未必的;不大可能的
  • For a time it seemed doubtful that he would move at all.

    有一段时间他似乎根本不会搬家。

  • It is doubtful whether Tweed, even with his fluent French, passed for one of the locals.

    尽管特威德能说一口流利的法语,他是否能被当作当地人还很难说。

  • Whether the authorities will allow inspection is highly doubtful.

    当局是否允许检查还是个大问号。

2 ADJ-GRADED [usually verb-link ADJ] 怀疑的;疑惑的;拿不定主意的 If you are doubtful about something, you feel unsure or uncertain about it. 怀疑的;疑惑的;拿不定主意的
  • I was still very doubtful about the chances for success. [+ about]

    我对能否成功仍然深表怀疑。

  • Why did he sound so doubtful?

    为什么他听上去如此不确定?

doubtfully
  • Keeton shook his head doubtfully.

    基顿疑惑地摇了摇头。

3 ADJ-GRADED [usually ADJ n] (质量或价值)低劣的,不可靠 If you say that something is of doubtful quality or value, you mean that it is of low quality or value. (质量或价值)低劣的,不可靠 [disapproval]
  • ...selling something that is overpriced or of doubtful quality.

    售卖漫天要价或质量低劣的东西

  • They also seemed of very doubtful value.

    它们好像也没有多大价值。

  • ...information that he described as having doubtful reliability.

    据他所称未必可靠的消息

4 ADJ-GRADED (通常指运动员因伤)不大可能参加(比赛)的 If a sports player is doubtful for a match or event, he or she seems unlikely to play, usually because of injury. (通常指运动员因伤)不大可能参加(比赛)的 [journalism]
  • Forsyth is doubtful for tonight's game with a badly bruised leg.

    福赛斯腿部严重擦伤,不大可能参加今晚的比赛。

Usage Note :
  • Do not confuse doubtful, dubious, and suspicious. If you feel doubtful about something, you are unsure about it or about whether it will happen or be successful. Do you feel insecure and doubtful about your ability?... It was doubtful he would ever see her again. If you are dubious about something, you are not sure whether it is the right thing to do. Alison sounded very dubious... The men in charge were a bit dubious about taking women on. If you describe something as dubious, you think it is not completely honest, safe, or reliable. ...his dubious abilities as a teacher. If you are suspicious of a person, you do not trust them and think they might be involved in something dishonest or illegal. I am suspicious of his intentions... Miss Lenaut had grown suspicious. If you describe something as suspicious, it suggests behaviour that is dishonest, illegal, or dangerous. He listened for any suspicious sounds. ...in suspicious circumstances.

    不要混淆 doubtful, dubious, suspiciousdoubtful 指不确定某事或不确定其是否会发生或成功:Do you feel insecure and doubtful about your ability(你对自己的能力缺乏信心,抱有怀疑吗),It was doubtful he would ever see her again(他会不会再见到她还说不准)。dubious 指拿不准做某事是否正确:Alison sounded very dubious(艾利森听上去犹豫不决),The men in charge were a bit dubious about taking women on(几位男性负责人有点儿拿不准要不要招女员工)。dubious 还可指某事物不完全可信、安全或可靠:his dubious abilities as a teacher(他的教学能力令人怀疑)。suspicious 指不信任某人,怀疑其从事欺骗性或不法活动:I am suspicious of his intentions(我怀疑他动机不纯),Miss Lenaut had grown suspicious(莱诺小姐已经起了疑心)。suspicious 还可指某人的行为可疑、不诚实、涉及非法或具有危险性:He listened for any suspicious sounds(他注意倾听任何可疑的声音),in suspicious circumstances(在可疑的情势下)。

Trends of doubtful
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TOEFL IELTS BNC: 4664 COCA: 9015
doubtful

adjective¹

1feeling doubt懷疑VERBS | ADVERB | PREPOSITION VERBSbe, feel, look, seem, sound懷疑;感到可疑;看上去可疑;好像可疑;聽起來可疑Eric was far from sure and Marion looked doubtful.埃里克根本沒有把握,馬里昂看上去也很疑惑。become開始疑惑remain一直懷疑ADVERBextremely, fairly, very, etc.極其/相當/非常懷疑a little, slightly, etc.有點兒/略有些懷疑PREPOSITIONabout懷疑⋯She was rather doubtful about the wisdom of eating the seafood.她很懷疑吃海鮮是否明智。
doubtful

adjective²

2unlikely不大可能VERBS | ADVERB VERBSbe, look, seem無把握;看上去無把握;好像無把握remain仍然無把握ADVERBextremely, fairly, very, etc.極其/相當/非常不確定highly非常不確定Even if we could go, which is highly doubtful, John wouldn't be able to come with us.即使我們能去 - 這還很沒準兒 - 約翰也不能和我們一起去。increasingly越來越不確定a little, slightly, etc.有點兒/稍微有些不確定
TOEFL IELTS BNC: 4664 COCA: 9015
doubtful adj.
unlikely1 (It is doubtful if he'll play tomorrow.) unsure (doubtful about sth)
TOEFL IELTS BNC: 4664 COCA: 9015
doubtful
Not likely to happen: unlikely, doubtful, remote...
Not definite or based on fact: apparently, supposed, alleged...
Uncertain about something: uncertain, unsure, doubtful...
Not suitable or convenient: unsuitable, inappropriate, inconvenient...

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