• "Sincerly" is a misspelling of "sincerely".
  • "Sincerely" means in a genuine and sincere way.
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Authentic Meaning and Examples
Sincerly vs. Sincerely: Which is Correct?

Sincerely

  • in a genuine and sincere way.
Example: I appreciate your efforts, and I sincerely hope that our teamwork will lead to the successful completion of the project.

In the sentence "I appreciate your efforts, and I sincerely hope that our teamwork will lead to the successful completion of the project," the word "sincerely" is used to convey the genuine and earnest nature of the hope expressed by the speaker. It is positioned before the statement of hope to emphasize the sincerity and authenticity of the sentiment. 
  • used as a formal and respectful closing in letters or emails, typically preceding the signature.
Example: "Thank you for considering my application. Sincerely, [Your Name]."

The use of "sincerely" in this closing indicates that the writer is expressing gratitude for the reader's consideration of their application and is closing the letter in a formal and sincere manner.

In the Ngram graph below, the word "sincerely" was used in the highest frequency between 1920s and 1980s, since then it has decreased in use.

Sincerly vs. Sincerely: Which is Correct?

Why would we misspell "sincerely" as "sincerly"?

The misspelling of "sincerely" as "sincerly" likely occurs due to simple typographical errors or mistakes in writing. People may inadvertently omit letters or switch their order while typing, especially in a rush or when not paying close attention. English spelling can be tricky, and errors can easily slip through, even in common words.

It's also possible that some individuals may not be familiar with the correct spelling of certain words, leading to unintentional misspellings. Auto-correction features in word processors or email clients can sometimes introduce errors or accept misspellings without correcting them, further contributing to the persistence of such mistakes.

Other misspellings

In this article from Ginger, the misspellings of sincerely and the percentage with which it is misspelled was listed below:

  • sincerly - 26.1%
  • sincerel - 5.6%
  • sincerley - 5.6%
  • sencerly - 4.1%
  • sincerily - 3.4%
  • sincerelly - 2.9%
  • sinceraly - 2.8%
  • sinserly - 2.4%
  • sicerely - 2.2%
  • sincearly - 1.9%
  • Other - 43%

Example sentences

  1. I sincerely appreciate your hard work and dedication to the project.
  2. Please accept my sincere apologies for any inconvenience caused.
  3. I want to express my sincere gratitude for your thoughtful gift.
  4. Sincerely, I believe that your expertise will greatly benefit the team.
  5. I sincerely hope that you find success in all your future endeavors.
  6. Thank you for your time and consideration; I sincerely value your input.
  7. I am sincerely impressed by the level of professionalism you demonstrated.
  8. Sincerely, your kindness has made a significant impact on my life.
  9. Please know that I am sincerely committed to achieving our common goals.
  10. Sincerely, I look forward to the opportunity to work with you again in the future.

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Sincerly vs. Sincerely: Which is Correct?

References:

Definition of SINCERELY
in a sincere or truthful way : with truth, genuineness, or straightforwardness —often used as a complimentary close with or without yours… See the full definition
Sincerly vs. Sincerely: Which is Correct?