Usage Note
Sincérité is the quality of being genuine and without pretence; the fixed phrase en toute sincérité means 'in all honesty' and is common in formal speech. The adjective sincère and adverb sincèrement (yours sincerely in letters) share the same root.
Examples
"Je vous parle en toute sincérité."
Natural Translation
I am speaking to you in all sincerity.

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