"doubts" is a correct and usable part of a sentence in written English.
You can use it to express doubt, uncertainty, or lack of confidence. Example: I have my doubts that she can finish the project in time.
Exact(60)
Sexual doubts?
Some doubts!
Bryant doubts it, too.
We have doubts.
One doubts that.
Still, the doubts continued.
Mr. Winter doubts it.
Reuther had his doubts.
Dufner doubts it.
Yet doubts persist.
Did he have doubts?
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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