Sentence examples for validity is doubtful from inspiring English sources

… [S]hort intervals of time acquire meaning only in connection with the equations of electrodynamics, whose validity is doubtful and which can be tested only in terms of the space and time coordinates which enter them.

The tsunami run-up is confirmed by a historical document or tradition, although its location is indicated only by a village name, and a detailed location is unclear D Validity is doubtful.

The validity of a fifth group of crustacean parasites is doubtful, namely the Cephalolobidae with around seven named species of gregarines (separated by Levine [39]).

That much is doubtful.

Mr Piketty is doubtful.

Danny Welbeck (muscle) is doubtful.

On that Harari is doubtful.

Fontana is doubtful.

But Twagirimana is doubtful.

However it is doubtful.

Bleasdale is doubtful.