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

For example, someone may sincerely believe a supplement, detox or alternative therapy helped when symptoms may have improved naturally or because of expectation alone. —Daryl Austin, USA Today, 18 June 2026

The back support was there, and as someone who’s five eleven, that was sincerely appreciated. —Audrey Lee, Architectural Digest, 15 June 2026

The stories are sincerely hilarious. —Wesley Stenzel, Entertainment Weekly, 11 June 2026

Museums are sincerely trying to connect with their publics (even if these are often cast as consumers), and the horizon for that experiment is almost limitless. —Katy Siegel, Artforum, 2 June 2026

Word History

First Known Use

1560, in the meaning defined above

Rhymes for sincerely

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