sincerely

adverb

sin·​cere·​ly sin-ˈsir-lē 

sən-

: 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 Brown

… Sincerely yours, John Smith

… Yours sincerely, Jane Doe

Synonyms of sincerely

• genuinely
• openly
• honestly
• naively
• simply
• naturally

Examples of sincerely in a Sentence

thanked them sincerely for their help

Recent Examples on the Web

Take a few extra moments to double-check your space, thank your host sincerely, and leave on a warm, unhurried note. —Jamie Cuccinelli, Martha Stewart, 22 May 2026

Sometimes people do sincerely want feedback on why their offer wasn’t good enough. —John Richardson attia Qureshi, CNBC, 22 May 2026

What makes the actor’s work so unnerving is how sincerely Cole appears to view himself as an admirer, protector, even benefactor to the Māori people who have disappeared under his care. —Alison Foreman, IndieWire, 17 May 2026

But there are millions of people who sincerely think some or all of those things are true and do not take a cross-country train and try to kill the president and his Cabinet. —Chris Stirewalt, The Hill, 28 Apr. 2026

Word History

First Known Use

1560, in the meaning defined above

Rhymes for sincerely

• cavalierly
• austerely
• severely
• clearly
• dearly
• merely
• nearly
• queerly
• yearly