an unknown person, or of an unknown person -- such as an unknown author, or donation of an unknown person
Everyone wonders who has been sending her anonymous love letters.
Everyone wonders who made the anonymous donation.
The author remained anonymous.
The police arrested her after an anonymous tip told them where to find the stolen diamonds.
"It’s been written anonymously," I say, "but with Hilly around, there’s still a good chance people will know it was me."
Kathryn Stockett -- The Help
Mrs. Bradley knew people had a difficult time saying nice things to each other, so she devised a way for us to anonymously say what we felt.
Jay Asher -- Thirteen Reasons Why
"The artist is anonymous," Bortz said,
Thomas Pynchon -- The Crying of Lot 49
Did she ever get anonymous letters?
Agatha Christie -- The ABC Murders
We plead with her, send anonymous notes.
Laurie Halse Anderson -- Speak
I wished I had an opera house. I wished I had a cathedral. I wished I could climb to the top of the Empire State Building like King Kong. Instead, I had only books, books and the anonymous streets of New York with their millions of stupid, clueless people.
Alex Flinn -- Beastly
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Everything about the restaurant is anonymous and interchangeable.
Haruki Murakami -- After Dark
I could see the magazine on the newsstands, and a lot of anonymous eyes looking at it,
Stephen Chbosky -- The Perks of Being a Wallflower
Middens of anonymous trash.
Cormac McCarthy -- The Road
Then the shelter collapsed with smothering finality; and the anonymous shapes fought their way out and through.
William Golding -- Lord of the Flies
There are only two ways of telling the complete truth—anonymously and posthumously.