sin·​cere·​ly sin-ˈsir-lē How to pronounce sincerely (audio)
: in a sincere or truthful way : with truth, genuineness, or straightforwardness
apologizing sincerely
I am sincerely sorry for your loss.
George Clooney, a pleasant man, tries sincerely to give some credibility to Kelvin, and if he doesn't earn our belief, at least he has our sympathy.Stanley Kauffman
The room was quiet until a student in the back of the room let out an enormous belch and said, not too sincerely, "Sorry."E. L. Konigsburg
often used as a complimentary close with or without yours
… Thank you for your attention to this matter. Sincerely, Robert BrownSincerely yours, John SmithYours sincerely, Jane Doe

Word History

First Known Use

1560, in the meaning defined above

Time Traveler
The first known use of sincerely was in 1560

Dictionary Entries Near sincerely

Cite this Entry

“Sincerely.” Dictionary, Merriam-Webster, Accessed 2 Feb. 2023.

More from Merriam-Webster on sincerely

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Commonly Confused Words Quiz

  • vector image of a face with thought expression
  • I went to the ______ store to buy a birthday card.
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?