doubtful

Bất chắc, nghi ngờ

not sure that something is true or will happen; feeling uncertain about something

• be doubtful (about sth)

Collocations doubtful about the future · doubtful of success

• I'm doubtful about his ability to do this job.

  Tôi nghi ngờ khả năng của anh ấy để làm công việc này.

Ít có thể, không chắc chắn

not likely to happen or be true; not probable

• be doubtful (that)

Collocations doubtful that the plan will work · doubtful whether it is possible

• It's doubtful that they'll arrive on time.

  Chắc chắn họ sẽ đến đúng giờ là điều khó xảy ra.