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Discover LudwigThe phrase "doubtful sincerity" is correct and can be used in written English.
It means that someone's sincerity or genuineness is questionable or uncertain. Example: His promises of change have been met with doubtful sincerity, as many doubt his true intentions.
Exact(3)
But it was enthusiastically welcomed in the East, and thanks to Constantine the new religion triumphed more rapidly; his official support led to the conversion of numerous pagans, although with doubtful sincerity because they were indifferent in their moral conviction.
Jonze doesn't show the transaction, doesn't show Theodore shelling out or uploading his credit-card info or clicking "Accept," and it matters — because the other cautionary aspect of "Her" would be: don't fall in love with a prostitute whom one has hired, because his or her expressions of ardor may well be of doubtful sincerity.
Jonze doesn't show the transaction, doesn't show Theodore shelling out or uploading his credit-card info or clicking "Accept," and it matters because the other cautionary aspect of "Her" would be: don't fall in love with a prostitute whom one has hired, because his or her expressions of ardor may well be of doubtful sincerity.
Similar(55)
Few doubt his sincerity.
"This is the only occasion on which I have ever offered more than the standard rate; but I have very great admiration for Mr Yates' work...". and so on, a profession whose sincerity, already doubtful, was made more doubtful still by his misspelling of Yeats's name.
And to prove the rebels' sincerity to a doubtful public, progress must be made on one or more issues that have hampered negotiations.
(Extremely doubtful).
'Racist?' Doubtful".
Highly doubtful.
Doubtful glances.
"Sincerity counts".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com