Sentence examples similar to are commonly doubtful from inspiring English sources

Combination preparations containing 'hidden' classes of drugs and food supplements or tonics of doubtful value were commonly used in India [ 6].

While commonly being translated as doubtful spring, a more accurate translation for the word twyfel is therefore "questionable" or "uncertain".

Investors are increasingly doubtful.

The benefits of multivitamins are looking doubtful.

They are very doubtful.

Others are doubtful.

Scientists are doubtful.

We are doubtful.

Republicans are doubtful.

Its critics are doubtful.

Some experts are doubtful.