Suggestions(5)
"is sincere" is a grammatically correct phrase and can be used in written English.
You can use it when describing someone's character or intentions, as in the following example: "John's apology was genuine and heartfelt. I could tell that he is sincere in his regret for his actions."
Dictionary
Exact(60)
The question is sincere.
This letter is sincere.
The director is sincere.
Currin is sincere.
This is sincere.
Our offer is sincere.
Syrian officials say the dialogue is sincere.
This song is sincere, bordering on corny.
Yet Mr Bao swears he is sincere.
She is uncompromising about what is sincere.
Perhaps he is sincere in his insincerity.
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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