The value of a European approach is in serious doubt.

But a number of other party members have serious doubts.

Sometimes I have serious doubts that nice girls are here to stay.

I had some serious doubts right from your first letter.

That the talks would continue had not been in serious doubt.

However, we have serious doubts about the management of this data.

I say this too with serious doubts in my mind.

I have serious doubts as to whether this is the right approach.

Indeed, there must be serious doubts about the decision to hold them this year.

Those others, if put to the question, would leave the Lady with serious doubts.