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The phrase 'is doubtful of' is correct and can be used in written English.
You can use it to express that someone is unsure or uncertain about something. Example: John is doubtful of the validity of the claims made in the article.
Exact(7)
Dragan Tasijevic is doubtful of the West.
But Finlayson is doubtful of that: there are simply too many bones, he said.
The V2G potential of Honda's full hybrid vehicles is unexplored, but the company is doubtful of using them to power homes.
Marta Sanchez, of the Mesoamerican Migrants' Movement, supports the new law in principle but is doubtful of its implementation: "The authorities view migration as a national security issue rather than an economic, human rights or human security issue.
Epstein himself is doubtful of interpersonal utility comparison, so he tends to favor policy moves that are Pareto improvements, improving someone's utility while reducing no one's.
The first piece of advice in the book sums up the madman perfectly: "Do not respect he whom you suspect is doubtful of your intentions towards him".
Similar(53)
I am doubtful of this.
Rural businesses are doubtful of the latest government plan.
Indeed, she added, she was doubtful of the prospect.
Vitoria was doubtful of the justice of the Spanish conquest of the New World.
Another reason to be doubtful of the Tamed Trump thesis is the nature of his mandate.
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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