mysteriously

adverb

mys·​te·​ri·​ous·​ly mi-ˈstir-ē-əs-lē 

: in a mysterious manner : in a way that is difficult to explain or comprehend

documents that have mysteriously disappeared

smiling mysteriously

"I've got the key to my castle in the air, but whether I can unlock the door remains to be seen," observed Jo mysteriously.

—Louisa May Alcott

Examples of mysteriously in a Sentence

Recent Examples on the Web

There’s a lot of attention given to treating it, but far less emphasis on a national health crisis: mysteriously declining testosterone levels in American men population-wide. —Sharyl Attkisson, Baltimore Sun, 4 Apr. 2025

High levels of carbon monoxide were detected in 14-year-old Miller Gardner's hotel room, Costa Rican police revealed more than one week after the son of former New York Yankees outfielder Brett Gardner mysteriously died on a family vacation. —Emily Shapiro, ABC News, 1 Apr. 2025

Although Putin's enemies have been known to fall mysteriously out of windows, and being poisoned abroad, Ananyev was a member of the government and a supporter of the war in Ukraine. —Ron Estes, MSNBC Newsweek, 31 Mar. 2025

Dawn broke to reveal its source: a long, narrow ridge of jagged ice that had mysteriously arisen across the lake’s surface, meandering like the spiked back of a twisting dragon. —Martin Fackler, New York Times, 28 Mar. 2025

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for mysteriously

• deliriously
• imperiously
• seriously