There is no doubt that she will succeed in her career.

Her doubtfulness about the decision was evident in her hesitant tone.

There are many doubtfulnesses surrounding the new policy.

There are many doubtfuls in the crowd.

There is no-doubt that she will win the competition.

I am in doubt about my decision.

He is such a doubting Thomas, always questioning everything.

There are always doubting Thomases in every group, but they eventually come around.

The doubting Thomasinas gathered to discuss their doubts.

She is often referred to as a doubting Thomasina because she always questions everything.