What Does Yours Sincerely Mean In A Letter?

What Does Yours Sincerely Mean In A Letter? What Does Yours sincerely mean in a letter? “Sincerely yours” indicates that the person sending the correspondence (and the information and sentiments presented) are trustworthy. What does your sincerely mean? honestly and without pretending or lying: I’m sincerely grateful. (yours) sincerely B1 (US also Sincerely yours) used